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X in (-oo:+oo)
(X^3)/3 = 20.5 // - 20.5
(X^3)/3-20.5 = 0
1/3*X^3 = 20.5 // : 1/3
X^3 = 61.50000062
X^3 = 61.50000062 // ^ 1/3
X = 61.50000062^(1/3)
X = 61.50000062^(1/3)
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