Re: math align

[David Arnold <dwarnold45@cox.net>]

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?