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X in (-oo:+oo)
(X^3)/7 = 28 // - 28
(X^3)/7-28 = 0
1/7*X^3 = 28 // : 1/7
X^3 = 196
X^3 = 196 // ^ 1/3
X = 196^(1/3)
X = 196^(1/3)
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