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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 13 // - 13
1/x-13 = 0
1*x^-1 = 13 // : 1
x^-1 = 13
-1 < 0
1/(x^1) = 13 // * x^1
1 = 13*x^1 // : 13
1/13 = x^1
x = 1/13
x = 1/13
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