I saw that stackoverflow thread. In my use case, I want to reduce the
maximum the redundancy in the expression. Or more specifically, I'm trying
to generate code that will produce the minimum amount of costly operation
(in my case, in addition to the ugly redundancy of constants, 2mul cost
more than 1mul 1add). Note that Wolframalpha seems to be able to propose an
appropriate alternate form. But anyway, I just hit another wall:
>>> sp.factor(0.35*x + 0.35*y)
0.35*(x + y)
>>> sp.factor(0.35*x - 0.35*y)
7.0*(0.05*x - 0.05*y)
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