[NTG-context] Canceling common primes with strikeout

14 Jan 2006

      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

David Arnold