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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-(3*x))/(x-1) = 0
(x^2-3*x)/(x-1) = 0
x^2-3*x = 0
x*(x-3) = 0
x-3 = 0 // + 3
x = 3
x*(x-3) = 0
(x*(x-3))/(x-1) = 0
( x-3 )
x-3 = 0 // + 3
x = 3
( x )
x = 0
x in { 3, 0 }
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