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