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x in (-oo:+oo)
x^4 = 5/9 // - 5/9
x^4-(5/9) = 0
x^4-5/9 = 0
1*x^4 = 5/9 // : 1
x^4 = 5/9
x^4 = 5/9 // ^ 1/4
abs(x) = (5/9)^(1/4)
x = (5/9)^(1/4) or x = -(5/9)^(1/4)
x in { (5/9)^(1/4), -(5/9)^(1/4) }
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