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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)
(x^2-4)/(x-1) = x-2 // - x-2
(x^2-4)/(x-1)-x+2 = 0
(x^2-4)/(x-1)+(-x*(x-1))/(x-1)+(2*(x-1))/(x-1) = 0
2*(x-1)-x*(x-1)+x^2-4 = 0
x+2*x-4-2 = 0
3*x-6 = 0
(3*x-6)/(x-1) = 0
(3*x-6)/(x-1) = 0 // * x-1
3*x-6 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x = 2
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