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x in (-oo:+oo)
(x^4)/3 = 8/27 // - 8/27
(x^4)/3-(8/27) = 0
(x^4)/3-8/27 = 0
1/3*x^4 = 8/27 // : 1/3
x^4 = 8/9
x^4 = 8/9 // ^ 1/4
abs(x) = (8/9)^(1/4)
x = (8/9)^(1/4) or x = -(8/9)^(1/4)
x in { (8/9)^(1/4), -(8/9)^(1/4) }
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