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x in (-oo:+oo)
5/9 = x^8 // - x^8
5/9-x^8 = 0
-1*x^8 = -5/9 // : -1
x^8 = 5/9
x^8 = 5/9 // ^ 1/8
abs(x) = (5/9)^(1/8)
x = (5/9)^(1/8) or x = -(5/9)^(1/8)
x in { (5/9)^(1/8), -(5/9)^(1/8) }
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