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5*x^8-(6/2) = 0
5*x^8-3 = 0
5*x^8 = 3 // : 5
x^8 = 3/5
x^8 = 3/5 // ^ 1/8
abs(x) = (3/5)^(1/8)
x = (3/5)^(1/8) or x = -(3/5)^(1/8)
x in { (3/5)^(1/8), -(3/5)^(1/8) }
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