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D( x )
(x-2)^3 = 0
(x-2)^2 = 0
(x-2)^3 = 0
(x-2)^3 = 0
x-2 = 0 // + 2
x = 2
(x-2)^2 = 0
(x-2)^2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(3*x)/((x-2)^3)-(4/((x-2)^2)) = 0
(3*x)/((x-2)^3)-4*(x-2)^-2 = 0
(3*x)/((x-2)^3)-4/((x-2)^2) = 0
(3*x)/((x-2)^3)+(-4*(x-2))/((x-2)^3) = 0
3*x-4*(x-2) = 0
8-x = 0
(8-x)/((x-2)^3) = 0
(8-x)/((x-2)^3) = 0 // * (x-2)^3
8-x = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x = 8
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