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3*(1/5)*x^8 = 7 // - 7
3*(1/5)*x^8-7 = 0
3/5*x^8 = 7 // : 3/5
x^8 = 35/3
x^8 = 35/3 // ^ 1/8
abs(x) = (35/3)^(1/8)
x = (35/3)^(1/8) or x = -(35/3)^(1/8)
x in { (35/3)^(1/8), -(35/3)^(1/8) }
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