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X in (-oo:+oo)
X^3 = 8/81 // - 8/81
X^3-(8/81) = 0
X^3-8/81 = 0
1*X^3 = 8/81 // : 1
X^3 = 8/81
X^3 = 8/81 // ^ 1/3
X = (8/81)^(1/3)
X = (8/81)^(1/3)
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