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x in (-oo:+oo)
((2/3)*x^6)/3 < 2/3 // - 2/3
((2/3)*x^6)/3-(2/3) < 0
((2/3)*x^6)/3-2/3 < 0
2/9*x^6 < 2/3
2/9*x^6 < 2/3 // : 2/9
x^6 < 2/3/2/9
x^6 < 3
x^6 < 3 // ^ 1/6
abs(x) < 3^(1/6)
x in (-3^(1/6):3^(1/6))
x in (-3^(1/6):3^(1/6))
(-3^(1/6):3^(1/6))
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