Comment #3 on issue 1968 by asmeurer: solve should not return infinities nor nan
http://code.google.com/p/sympy/issues/detail?id=1968
The limit(solve(f(x) - y), x)[0], y, 0) way from comment 31 in issue 1694 is the best (because limit is smarter than direct evaluation), but I agree that maybe we could have a front-end to this through some option or a separate function.
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