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(x^7)/2+5 = 8 // - 8
(x^7)/2-8+5 = 0
1/2*x^7 = 3 // : 1/2
x^7 = 6
x^7 = 6 // ^ 1/7
x = 6^(1/7)
x = 6^(1/7)
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