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X in (-oo:+oo)
X^(1/3) = 2/5 // - 2/5
X^(1/3)-(2/5) = 0
X^(1/3)-2/5 = 0
1*X^(1/3) = 2/5 // : 1
X^(1/3) = 2/5
X^(1/3) = 2/5 // ^ 3
X = 8/125
X = 8/125
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