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x in (-oo:+oo)
(4/9)*x^3 = x // - x
(4/9)*x^3-x = 0
4/9*x^3-x = 0
x*(4/9*x^2-1) = 0
4/9*x^2 = 1 // : 4/9
x^2 = 9/4
x^2 = 9/4 // ^ 1/2
abs(x) = 3/2
x = 3/2 or x = -3/2
x = 0
x = 0
x in { 3/2, -3/2, 0 }
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