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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-(3/x) = 9 // - 9
-(3/x)-9 = 0
-3*x^-1-9 = 0
-3*x^-1 = 9 // : -3
x^-1 = -3
-1 < 0
1/(x^1) = -3 // * x^1
1 = -3*x^1 // : -3
-1/3 = x^1
x = -1/3
x = -1/3
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