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