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X in (-oo:+oo)
8/9 = X^16 // - X^16
8/9-X^16 = 0
-1*X^16 = -8/9 // : -1
X^16 = 8/9
X^16 = 8/9 // ^ 1/16
abs(X) = (8/9)^(1/16)
X = (8/9)^(1/16) or X = -(8/9)^(1/16)
X in { (8/9)^(1/16), -(8/9)^(1/16) }
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