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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 15 // - 15
5/x-15 = 0
5*x^-1 = 15 // : 5
x^-1 = 3
-1 < 0
1/(x^1) = 3 // * x^1
1 = 3*x^1 // : 3
1/3 = x^1
x = 1/3
x = 1/3
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