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x in (-oo:+oo)
x^(2/3) = 1/9 // - 1/9
x^(2/3)-(1/9) = 0
x^(2/3)-1/9 = 0
1*x^(2/3) = 1/9 // : 1
x^(2/3) = 1/9
x^(2/3) = 1/9 // ^ 3
x^2 = 1/729 // ^ 1/2
abs(x) = 1/27
x = 1/27 or x = -1/27
x in { 1/27, -1/27 }
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