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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)
(x-1)/(x-2) = 2 // - 2
(x-1)/(x-2)-2 = 0
(x-1)/(x-2)+(-2*(x-2))/(x-2) = 0
x-2*(x-2)-1 = 0
3-x = 0
(3-x)/(x-2) = 0
(3-x)/(x-2) = 0 // * x-2
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x = 3
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