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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-3/4 = 15/x // - 15/x
-(15/x)-3/4 = 0
-15*x^-1-3/4 = 0
-15*x^-1 = 3/4 // : -15
x^-1 = -1/20
-1 < 0
1/(x^1) = -1/20 // * x^1
1 = -1/20*x^1 // : -1/20
-20 = x^1
x = -20
x = -20
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