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X in (-oo:+oo)
(X^3)/8-3 = 7 // - 7
(X^3)/8-7-3 = 0
1/8*X^3 = 10 // : 1/8
X^3 = 80
X^3 = 80 // ^ 1/3
X = 2*10^(1/3)
X = 2*10^(1/3)
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