Hans, Willi, et al,
I was thinking there are pros and cons to each solution, Hans' and
Willi's. So I tried:
Here are some simple examples of adding fractions already having
common denominators.
%output=pdf
\input math-ext
\starttext
\placeformula[-]
\startformula
\startalign[m=2,distance=5em]
\frac5{21}-\frac3{21}&=\frac{5-3}{21} &
\frac{2}{x+2}-\frac{x-3}{x+2}&=\frac{2-(x-3)}{x+2}\\
&=\frac2{21} & &=\frac{2-x+3}{x+2}\\
&&&=\frac{5-x}{x+2}
\stopalign
\stopformula
\startbuffer[1]
\framed[frame=on,width=fit]
{\startformula
\eqalign{
\frac{5}{21}-\frac{3}{21}
&=\frac{5-3}{21}\cr
&=\frac{2}{21}}
\stopformula}
\stopbuffer
\startbuffer[2]
\framed[frame=on,width=fit]
{\startformula
\eqalign{
\frac2{x+2}-\frac{x-3}{x+2}
&=\frac{2-(x-3)}{x+2}\cr
&=\frac{2-x+3}{x+2}\cr
&=\frac{5-x}{x+2}}
\stopformula}
\stopbuffer
\startbuffer
\startcombination[2*1]
{\externalfigure[1][width=0.45\textwidth,type=buffer]}{}
{\externalfigure[2][width=0.45\textwidth,type=buffer]}{}
\stopcombination
\stopbuffer
\placefigure
[][-]
{none}
{\getbuffer}
\stoptext
As you can see, Hans' solution works perfectly, but note the very
ugly source code for that section. Willi's source is cleaner, much
easier to read (especially at a later date when I will have to
revisit for revisions), but it doesn't work (the output is scaled of
course).
Any suggestions as to how I can fix Willi's approach so it doesn't
scale?
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