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X in (-oo:+oo)
(X^4)/9 = 3 // - 3
(X^4)/9-3 = 0
1/9*X^4 = 3 // : 1/9
X^4 = 27
X^4 = 27 // ^ 1/4
abs(X) = 27^(1/4)
X = 27^(1/4) or X = -27^(1/4)
X in { 27^(1/4), -27^(1/4) }
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