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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(6*x+6)/(x-2) = 12 // - 12
(6*x+6)/(x-2)-12 = 0
(6*x+6)/(x-2)+(-12*(x-2))/(x-2) = 0
6*x-12*(x-2)+6 = 0
30-6*x = 0
(30-6*x)/(x-2) = 0
(30-6*x)/(x-2) = 0 // * x-2
30-6*x = 0
30-6*x = 0 // - 30
-6*x = -30 // : -6
x = -30/(-6)
x = 5
x = 5
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