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