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D( x )
(x-2)^2 = 0
(x-2)^2 = 0
(x-2)^2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(4*x)/((x-2)^2) = 0
4*x = 0 // : 4
x = 0
x = 0
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