Comment #8 on issue 1572 by smi...@gmail.com: solve() should be able to
solve expressions where variable only appears once
http://code.google.com/p/sympy/issues/detail?id=1572
Although `sqrt(x**2)` is not always equal to `x`, if you say that
`sqrt(x**2) = 3` then x can be `+/-3`, and that's what solve returns.
>>> solve(sqrt(x**2)-3)
[3, -3]
>>> solve(log(exp(x))-I)
[I]
>>> solve(log(exp(x))-2)
[2]
Is there a case where you think there is a problem?
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