Comment #1 on issue 3546 by asmeu...@gmail.com: 0*x http://code.google.com/p/sympy/issues/detail?id=3546
I think this was discussed before. If 0*x remained unevaluated, then nothing would work like you want it to. x - x would not go to 0. Try making the change in the core and seeing how many tests fail.
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