Comment #4 on issue 2107 by asmeurer: Real(0.1, 10) - Real(0.1, 10) -> 3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107
Actually, we also need to figure out what makes it go wrong in Add and fix it there too, so that explicitly calling Add(Real(0.1, 10), -Real(0.1, 10)) works too.
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