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x in (-oo:+oo)
(x^4)/3 = 16 // - 16
(x^4)/3-16 = 0
1/3*x^4 = 16 // : 1/3
x^4 = 48
x^4 = 48 // ^ 1/4
abs(x) = 2*3^(1/4)
x = 2*3^(1/4) or x = -(2*3^(1/4))
x in { 2*3^(1/4), -(2*3^(1/4)) }
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