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X in (-oo:+oo)
X^8-(1/2) = 6 // - 6
X^8-(1/2)-6 = 0
X^8-1/2-6 = 0
1*X^8 = 13/2 // : 1
X^8 = 13/2
X^8 = 13/2 // ^ 1/8
abs(X) = (13/2)^(1/8)
X = (13/2)^(1/8) or X = -(13/2)^(1/8)
X in { (13/2)^(1/8), -(13/2)^(1/8) }
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