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