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x in (-oo:+oo)
x^(2/3) = 0.25 // - 0.25
x^(2/3)-0.25 = 0
1*x^(2/3) = 0.25 // : 1
x^(2/3) = 0.25
x^(2/3) = 0.25 // ^ 3
x^2 = 0.25^3 // ^ 1/2
abs(x) = 0.25^(3/2)
x = 0.25^(3/2) or x = -0.25^(3/2)
x in { 0.25^(3/2), -0.25^(3/2) }
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