Comment #5 on issue 3145 by smi...@gmail.com: simultaneous substitution http://code.google.com/p/sympy/issues/detail?id=3145
"simultaneous=True" seems like a better keyword to me.
what about 'static' (as in "subsequent replacements don't affect former replacements" and "all replacement is done before evaluation is done". (Simultaneous is so long...not as long as could_extract_minus_sign(), though!)
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