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D( x )
(x-1)^2 = 0
(x-1)^2 = 0
(x-1)^2 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(23*(x-1))/((x-1)^2) = 0
23/(x-1) = 0
x belongs to the empty set
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