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X in (-oo:+oo)
X^3 = 216/512 // - 216/512
X^3-(216/512) = 0
X^3-27/64 = 0
1*X^3 = 27/64 // : 1
X^3 = 27/64
X^3 = 27/64 // ^ 1/3
X = 3/4
X = 3/4
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