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(x^15)/8 = 1/2 // - 1/2
(x^15)/8-(1/2) = 0
(x^15)/8-1/2 = 0
1/8*x^15 = 1/2 // : 1/8
x^15 = 4
x^15 = 4 // ^ 1/15
x = 4^(1/15)
x = 4^(1/15)
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