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x in (-oo:+oo)
(x^4)/3 = 9 // - 9
(x^4)/3-9 = 0
1/3*x^4 = 9 // : 1/3
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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