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