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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)
(4*x+4)/(x-1) = 0
4*x+4 = 0 // - 4
4*x = -4 // : 4
x = -4/4
x = -1
x = -1
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