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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 = x/(x-1) // - x/(x-1)
x-(x/(x-1)) = 0
(-1*x)/(x-1)+x = 0
(-1*x)/(x-1)+(x*(x-1))/(x-1) = 0
x*(x-1)-1*x = 0
x^2-2*x = 0
x^2-2*x = 0
x*(x-2) = 0
x-2 = 0 // + 2
x = 2
x*(x-2) = 0
(x*(x-2))/(x-1) = 0
(x*(x-2))/(x-1) = 0 // * x-1
x*(x-2) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x )
x = 0
x in { 2, 0 }
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