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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-12/x = 3-(18/x)-4 // - 3-(18/x)-4
18/x-12/x-3+4 = 0
6*x^-1 = -1 // : 6
x^-1 = -1/6
-1 < 0
1/(x^1) = -1/6 // * x^1
1 = -1/6*x^1 // : -1/6
-6 = x^1
x = -6
x = -6
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