Comment #18 on issue 1358 by wflynny: (e*f*e*f).subs(e*f,f*e+h) fails if  
e*f is not commutative
http://code.google.com/p/sympy/issues/detail?id=1358

I can't seem to be able to run those tests correctly despite reading the  
tutorial.
Could you please tell me where bin/test is?

I wrote the following patch and test for mul.py. It's very cumbersome and  
there is
still one large problem: division with substitution of more than 1 symbol  
in the
denominator. Still haven't quite figured that out yet. Anyway, thought it  
would be nice
to update.

Attachments:
        test.py  3.7 KB
        mul_patch.diff  12.0 KB

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