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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 75 // - 75
15/x-75 = 0
15*x^-1 = 75 // : 15
x^-1 = 5
-1 < 0
1/(x^1) = 5 // * x^1
1 = 5*x^1 // : 5
1/5 = x^1
x = 1/5
x = 1/5
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