Comment #4 on issue 4046 by [email protected]: solving equation with multiple abs runs into problems if symbols are real
http://code.google.com/p/sympy/issues/detail?id=4046

You could just do expr.replace(Abs, Lambda(x, Piecewise((x, x >=0), (-x, x < 0), (Abs(x), True))) and then use piecewise_fold. You could also potentially be more clever and avoid the otherwise condition if you know the argument is real.

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