Updates: Labels: Printing Comment #11 on issue 2151 by asmeurer: BasicMeta.keep_sign http://code.google.com/p/sympy/issues/detail?id=2151
There was a similar error in the printing when I tried removing the automatic distribution 2*(x + y) => 2*x + 2*y. I don't know if it's related. See issue 1497, comment 12.
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