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(1/3)*x^7 = 25 // - 25
(1/3)*x^7-25 = 0
1/3*x^7 = 25 // : 1/3
x^7 = 75
x^7 = 75 // ^ 1/7
x = 75^(1/7)
x = 75^(1/7)
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