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X in (-oo:+oo)
(X/4)^3 = 7 // - 7
(X/4)^3-7 = 0
1/64*X^3 = 7 // : 1/64
X^3 = 448
X^3 = 448 // ^ 1/3
X = 4*7^(1/3)
X = 4*7^(1/3)
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