Comment #12 on issue 935 by [email protected]: .match() behaves in a random manner.
http://code.google.com/p/sympy/issues/detail?id=935
Actually, if I remember correctly, match can still be different because it iterates over a dictionary. But the point is that if you don't want p and q to match an expression with x, then you should add exclude=[x] when you create them.
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