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