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X in (-oo:+oo)
((3+5)*X^18)/9-3 = 0
8/9*X^18 = 3 // : 8/9
X^18 = 27/8
X^18 = 27/8 // ^ 1/18
abs(X) = (27/8)^(1/18)
X = (27/8)^(1/18) or X = -(27/8)^(1/18)
X in { (27/8)^(1/18), -(27/8)^(1/18) }
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