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