ahh, I see. Do you feel like you've got a working solution, then, with
your flattening approach? Just another recommendation: you might check
the results with atoms -- if no terms were combined, then the atoms
should be the same and the expressions should evaluate to be the same:
>>> x1=Add(x+y,x,evaluate=0)
>>> x2=Add(y,x,evaluate=0)
>>> x3=x+y+x
>>> def eq(x1,x3):
... return x3.atoms()==x1.atoms() and simplify(x1)==simplify(x3)
...
>>> eq(x1,x2)
False
>>> eq(x1,x3)
False
>>> eq(x1,Add(x,y,x,evaluate=False))
True
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