Comment #3 on issue 2568 by smi...@gmail.com: Not combining like non-commutative terms if hidden behind numerical Muls
http://code.google.com/p/sympy/issues/detail?id=2568
Although I simplified the logic that was there, the condition of commutativity preceded my change. As all Adds are commutative, I agree that there is no reason to not distribute the constant.
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