Comment #8 on issue 978 by smi...@gmail.com: extract (-1) from all
expressions canonically
http://code.google.com/p/sympy/issues/detail?id=978
The "sign simplification" referred to above should have used the following:
z.subs([(a, Mul(-1, -a, evaluate=False)) for a in z.atoms(Add) if
a.could_extract_minus_sign()])
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