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(1/4)*x^7 = 20 // - 20
(1/4)*x^7-20 = 0
1/4*x^7 = 20 // : 1/4
x^7 = 80
x^7 = 80 // ^ 1/7
x = 80^(1/7)
x = 80^(1/7)
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