Comment #7 on issue 2009 by asmeurer: Document why solve((x-y,y),x) is None http://code.google.com/p/sympy/issues/detail?id=2009
Often what Maple or Mathematica does is cited because we know that they have already faced the same problems we have and have probably come up with a good solution to them. But considering they do different things in this case, it doesn't really hold valid for that argument.
So I am also fine with the changes suggested in comment 4, only someone needs to implement them :)
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