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D( x )
(x-1)^3 = 0
(x-1)^3 = 0
(x-1)^3 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(4*x)/((x-1)^3) = 0
4*x = 0 // : 4
x = 0
x = 0
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