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x in (-oo:+oo)
x^(2/3) = 2.17 // - 2.17
x^(2/3)-2.17 = 0
1*x^(2/3) = 2.17 // : 1
x^(2/3) = 2.17
x^(2/3) = 2.17 // ^ 3
x^2 = 2.17^3 // ^ 1/2
abs(x) = 2.17^(3/2)
x = 2.17^(3/2) or x = -2.17^(3/2)
x in { 2.17^(3/2), -2.17^(3/2) }
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