Comment #52 on issue 1694 by smichr: solve has many issues with fractions http://code.google.com/p/sympy/issues/detail?id=1694
As per comment 8, checking if "0 in result" might fail. Perhaps a comment could be put there to the effect, "simplification of results might be necessary to find out if a 0 is present or not" would be good. I have a equal() function that is part of work waiting to be reviewed that would (hopefully) robustly tell if there is a 0 present or not. I might rework it to look more like your checksol, however.
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