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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 15/18 // - 15/18
5/x-(15/18) = 0
5/x-5/6 = 0
5*x^-1 = 5/6 // : 5
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x = 6
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