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x in (-oo:+oo)
((2/3)*x^3)/3 < 2/3 // - 2/3
((2/3)*x^3)/3-(2/3) < 0
((2/3)*x^3)/3-2/3 < 0
2/9*x^3 < 2/3
2/9*x^3 < 2/3 // : 2/9
x^3 < 2/3/2/9
x^3 < 3
x^3 < 3 // ^ 1/3
x < 3^(1/3)
x in (-oo:3^(1/3))
x in (-oo:3^(1/3))
(-oo:3^(1/3))
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