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D( x )
x^3-8 = 0
x^3-8 = 0
x^3-8 = 0
1*x^3 = 8 // : 1
x^3 = 8
x^3 = 8 // ^ 1/3
x = 2
x in (-oo:2) U (2:+oo)
(6*x)/(x^3-8) = 0
6*x = 0 // : 6
x = 0
x = 0
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