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D( x )
(x-8)^2 = 0
(x-8)^2 = 0
(x-8)^2 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
(2*x^2-32)/((x-8)^2) = 0
2*x^2 = 32 // : 2
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in { 4, -4 }
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