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5*x^(7/5)-20 = 0
5*x^(7/5) = 20 // : 5
x^(7/5) = 4
x^(7/5) = 4 // ^ 5
x^7 = 1024 // ^ 1/7
x = 2*8^(1/7)
x = 2*8^(1/7)
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