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X in (-oo:+oo)
X^(3/5) = 8 // - 8
X^(3/5)-8 = 0
1*X^(3/5) = 8 // : 1
X^(3/5) = 8
X^(3/5) = 8 // ^ 5
X^3 = 32768 // ^ 1/3
X = 32
X = 32
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