Comment #4 on issue 2618 by asmeurer: Solve fails on expressions containing finite symbols
http://code.google.com/p/sympy/issues/detail?id=2618
Improving Add.is_finite is fine (it would be in add.py), but that's not the problem here. (-y-3).is_finite is None, so solve() should be letting it through. There's a bug in the code added by the commit I referenced above.
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