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(((x^7)/2)^3)/7 = 8 // - 8
(((x^7)/2)^3)/7-8 = 0
1/56*x^21 = 8 // : 1/56
x^21 = 448
x^21 = 448 // ^ 1/21
x = 448^(1/21)
x = 448^(1/21)
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