Comment #25 on issue 2552 by [email protected]: (1/(x*y)).subs(x*y, whatever) doesn't work
http://code.google.com/p/sympy/issues/detail?id=2552

If it was fixed to give (x*y, -1) it would work, wouldn't it?

Also, if by 'implicit substitution' you mean internally treating
`subs(x*y, foo)` as `subs(x, foo/y)` I would be against that on the
'refuse the temptation to guess' principle.

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