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x in (-oo:+oo)
(x/5)*x*x^4 = 1/3 // - 1/3
(x/5)*x*x^4-(1/3) = 0
(x/5)*x*x^4-1/3 = 0
1/5*x^6 = 1/3 // : 1/5
x^6 = 5/3
x^6 = 5/3 // ^ 1/6
abs(x) = (5/3)^(1/6)
x = (5/3)^(1/6) or x = -(5/3)^(1/6)
x in { (5/3)^(1/6), -(5/3)^(1/6) }
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