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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x)/x-3 = 12/x-3+2 // - 12/x-3+2
(4*x)/x-(12/x)-3-2+3 = 0
(4*x)/x-12*x^-1-3-2+3 = 0
-12*x^-1 = -2 // : -12
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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