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x in (-oo:+oo)
(x^4)/3 = 1296 // - 1296
(x^4)/3-1296 = 0
1/3*x^4 = 1296 // : 1/3
x^4 = 3888
x^4 = 3888 // ^ 1/4
abs(x) = 6*3^(1/4)
x = 6*3^(1/4) or x = -(6*3^(1/4))
x in { 6*3^(1/4), -(6*3^(1/4)) }
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