Comment #13 on issue 2820 by [email protected]: expand() doesn't work in the denominator
http://code.google.com/p/sympy/issues/detail?id=2820

The expression in comment 10 still does not expand completely with the recent expand changes:

n = -1 + 1/x
z=n/x/(-n)**2-1/n/x
z.expand()
-1/(x - 2 + 1/x) - 1/(-x + 1) + 1/(x*(x - 2 + 1/x))
pprint(_)
      1         1            1
- --------- - ------ + -------------
          1   -x + 1     /        1\
  x - 2 + -            x*|x - 2 + -|
          x              \        x/


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