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D( x )
x+8 = 0
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x in (-oo:-8) U (-8:+oo)
(x^3+512)/(x+8) = 0
1*x^3 = -512 // : 1
x^3 = -512
x^3 = -512 // ^ 1/3
x = -8
x in { -8}
x belongs to the empty set
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