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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)
4/(x-2) = 6/3 // - 6/3
4/(x-2)-(6/3) = 0
4/(x-2)-2 = 0
4/(x-2)+(-2*(x-2))/(x-2) = 0
4-2*(x-2) = 0
8-2*x = 0
(8-2*x)/(x-2) = 0
(8-2*x)/(x-2) = 0 // * x-2
8-2*x = 0
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
x = 4
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