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