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