Comment #4 on issue 2258 by [email protected]: doctest fails in master http://code.google.com/p/sympy/issues/detail?id=2258
It's indeed strange. SymPy is known for this annoying manipulation of minus sign, but in this case the order of terms should be different. Can you reproduce this in a terminal? Lets assume the expression is `expr`, can you show us expr.args and expr[-1].args (-1 should stand for Add() in `expr` but you will have to check this)?
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