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