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x in (-oo:+oo)
(1/3)*x^6 = 8 // - 8
(1/3)*x^6-8 = 0
1/3*x^6 = 8 // : 1/3
x^6 = 24
x^6 = 24 // ^ 1/6
abs(x) = 24^(1/6)
x = 24^(1/6) or x = -24^(1/6)
x in { 24^(1/6), -24^(1/6) }
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