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x in (-oo:+oo)
(256*x^4)/3 = 81 // - 81
(256*x^4)/3-81 = 0
256/3*x^4 = 81 // : 256/3
x^4 = 243/256
x^4 = 243/256 // ^ 1/4
abs(x) = (243/256)^(1/4)
x = (243/256)^(1/4) or x = -(243/256)^(1/4)
x in { (243/256)^(1/4), -(243/256)^(1/4) }
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