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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(2*x)/(x-3) = -4 // + 4
(2*x)/(x-3)+4 = 0
(2*x)/(x-3)+(4*(x-3))/(x-3) = 0
4*(x-3)+2*x = 0
6*x-12 = 0
(6*x-12)/(x-3) = 0
(6*x-12)/(x-3) = 0 // * x-3
6*x-12 = 0
6*x-12 = 0 // + 12
6*x = 12 // : 6
x = 12/6
x = 2
x = 2
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