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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = -5 // + 5
5/x+5 = 0
5*x^-1 = -5 // : 5
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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