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X in (-oo:+oo)
(X^3)/4 = 279 // - 279
(X^3)/4-279 = 0
1/4*X^3 = 279 // : 1/4
X^3 = 1116
X^3 = 1116 // ^ 1/3
X = 1116^(1/3)
X = 1116^(1/3)
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