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