Comment #27 on issue 2039 by julien.rioux: Mul.eval_subs problems
http://code.google.com/p/sympy/issues/detail?id=2039
Got another one for you
In [1]: from sympy import *
In [2]: a,b,c=symbols('abc')
In [3]: (-I*a*b).subs(a*b,c)
Out[3]: I*c
Should have been -I*c. The bug is in master as well.
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