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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
w = u/x // - u/x
w-(u/x) = 0
-u*x^-1 = -w // : -u
x^-1 = w/u
-1 < 0
1/(x^1) = w/u // * x^1
1 = (w/u)*x^1 // : w/u
1/(w/u) = x^1
x = 1/(w/u)
x = 1/(w/u)
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