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x in (-oo:+oo)
x^(2/3) = 7.5 // - 7.5
x^(2/3)-7.5 = 0
1*x^(2/3) = 7.5 // : 1
x^(2/3) = 7.5
x^(2/3) = 7.5 // ^ 3
x^2 = 7.5^3 // ^ 1/2
abs(x) = 7.5^(3/2)
x = 7.5^(3/2) or x = -7.5^(3/2)
x in { 7.5^(3/2), -7.5^(3/2) }
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