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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/15 = 6/x // - 6/x
1/15-(6/x) = 0
1/15-6*x^-1 = 0
-6*x^-1 = -1/15 // : -6
x^-1 = 1/90
-1 < 0
1/(x^1) = 1/90 // * x^1
1 = 1/90*x^1 // : 1/90
90 = x^1
x = 90
x = 90
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