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