Otdfbt

I am trying to achieve the formatting in the image attached, with the bracketed right equation/text aligned to the right side of the page. However, I would also like to be able to align the equal signs on the left hand expressions, whilst also aligning the most side of each line with the left hand side of the page.

I have attempted to do this using align and /hfill; however I suspect this is not exactly efficient or correct. I am not a Latex expert, I would just like to make lists of these fairly simple equations look pretty.

Any assistance would be greatly appreciated.

The code I have used is below:

documentclassarticle
usepackageamsmath
begindocument
beginalign*
par vspace3mm R_1 &= dfracwl2 \
par vspace3mm R_2 &= R_1 \
par vspace3mm V_x &= wleft(dfracl2-xright) \
par vspace3mm V_max &= R_1=R_2 hfill text(at;R_1;textand;R_2text) \
par vspace3mm M_max&=dfracwl^28 hfill text(at centre)\
par vspace3mm M_x&=dfracwx2left(l-xright) \
par vspace3mm Delta_max&=dfrac5wl^4384EI \
par vspace3mm Delta_x&=dfracwx24EIleft(l^3-2lx^2+x^3right) hfill text(at centre)\
endalign*
enddocument

Many thanks and kind regards

Some preliminary notes:

• 
  R_1 is wrong and should be R_1 (similarly for the other cases)


• “max” in a subscript should be upright


• 
  par and vspace are meaningless in a math display


• the last line in a display should not end with \
  

In the code below I used showframe just to show the page margins; don't use it yourself.

You can use the eqparbox environment. Each use should have a unique label, in this case A. Use a different one for each display where you need lefteqbox.

I also added how I would typeset the display.

documentclassarticle
usepackageamsmath,eqparbox

newcommandlefteqbox[2]%
 eqparbox[t]#1$displaystyle#2$hfil%


usepackageshowframe

begindocument

This is possibly what you want to achieve
beginflalign*
lefteqboxAR_1 &= fracwl2 \[1ex]
lefteqboxAR_2 &= R_1 \[1ex]
lefteqboxAV_x &= wleft(fracl2-xright) \[1ex]
lefteqboxAV_max &= R_1=R_2
 & text(at $R_1$ and $R_2$) & \[1ex]
lefteqboxAM_max &= fracwl^28
 & text(at centre) &\[1ex]
lefteqboxAM_x &= fracwx2(l-x) \[1ex]
lefteqboxADelta_max &= frac5wl^4384EI \[1ex]
lefteqboxADelta_x &= fracwx24EI(l^3-2lx^2+x^3) 
 & text(at centre) &
endflalign*
However, my opinion is that the following is better and clearer
beginalignat*2
R_1 &= fracwl2 \[1ex]
R_2 &= R_1 \[1ex]
V_x &= wleft(fracl2-xright) \[1ex]
V_max &= R_1=R_2
 &qquad& text(at $R_1$ and $R_2$) \[1ex]
M_max &= fracwl^28
 &qquad& text(at centre) \[1ex]
M_x &= fracwx2(l-x) \[1ex]
Delta_max &= frac5wl^4384EI \[1ex]
Delta_x &= fracwx24EI(l^3-2lx^2+x^3) 
 &qquad& text(at centre)
endalignat*

enddocument

A different realization exploiting tabular*:

documentclassarticle
usepackageamsmath,array

usepackageshowframe

begindocument

[
begintabular*displaywidth
 @
 >$displaystylel<$
 @
 >$displaystylel<$
 @extracolsepfill
 r
 @

R_1 &= fracwl2 \[2ex]
R_2 &= R_1 \[2ex]
V_x &= wleft(fracl2-xright) \[2ex]
V_max &= R_1=R_2 & (at $R_1$ and $R_2$) \[2ex]
M_max &= fracwl^28 & (at centre) \[2ex]
M_x &= fracwx2(l-x) \[2ex]
Delta_max &= frac5wl^4384EI \[2ex]
Delta_x &= fracwx24EI(l^3-2lx^2+x^3) & (at centre)
endtabular*
]

enddocument

With the help or an array you can achieve the following layout:

documentclassarticle
usepackageamsmath
usepackagearray

begindocument
setlengthextrarowheight10pt
[
beginarrayllr
 R_1 &= dfracwl2 \
 R_2 &= R_1 \
 V_x &= wleft(dfracl2-xright) \
V_max &= R_1=R_2 & text(at;R_1;textand;R_2text) \
 M_max&=dfracwl^28 & text(at centre)\
 M_x&=dfracwx2left(l-xright) \
 Delta_max&=dfrac5wl^4384EI \
 Delta_x&=dfracwx24EIleft(l^3-2lx^2+x^3right) & text(at centre)\
endarray
]
enddocument

With flalign* and package eqparbox:

documentclass[11pt]article
usepackage[utf8]inputenc
usepackage[T1]fontenc 
usepackagemathtools
usepackageeqparbox 
newcommandeqmathbox[2][M] eqmakebox[#1][l]$displaystyle #2$

begindocument

beginflalign*
eqmathboxR_1 &= fracwl2 \[1ex]
eqmathboxR_2 &= R_1\[1ex]
 eqmathboxV_x &= wleft(fracl2-xright)\[1ex]
 eqmathboxV_max &= R_1=R_2 & & & text(at;R_1 text and R_2text)\[1ex]
 eqmathboxM_max&=fracwl^28 & & & text(at centre)\[1ex]
 eqmathboxM_x&=fracwx2left(l-xright)\[1ex]
 eqmathboxDelta_max&=frac5wl^4384EI\[1ex]
 eqmathboxDelta_x&=fracwx24EIleft(l^3-2lx^2+x^3right) & & & text(at centre)
endflalign*

enddocument