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From: David Arnold <dwarnold45@cox.net>
Newsgroups: gmane.comp.tex.context
Subject: Canceling common primes with strikeout
Date: Fri, 13 Jan 2006 23:02:53 -0800
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Xref: news.gmane.org gmane.comp.tex.context:25162
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All,

Anyone have a nice technique to "strike out" the common primes using  
the color red?

\placeformula[-]
\startformula
   \frac{12}{18}=\frac{2\cdot2\cdot3}{2\cdot3\cdot3}=\frac23
\stopformula