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8*x^7-(5/2) = 0
8*x^7-5/2 = 0
8*x^7 = 5/2 // : 8
x^7 = 5/16
x^7 = 5/16 // ^ 1/7
x = (5/16)^(1/7)
x = (5/16)^(1/7)
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