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x in (-oo:+oo)
x^(2/3) = 21.6 // - 21.6
x^(2/3)-21.6 = 0
1*x^(2/3) = 21.6 // : 1
x^(2/3) = 21.6
x^(2/3) = 21.6 // ^ 3
x^2 = 21.6^3 // ^ 1/2
abs(x) = 21.6^(3/2)
x = 21.6^(3/2) or x = -21.6^(3/2)
x in { 21.6^(3/2), -21.6^(3/2) }
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