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x in (-oo:+oo)
(2*x)^(2/3) = 1 // - 1
(2*x)^(2/3)-1 = 0
2^(2/3)*x^(2/3) = 1 // : 2^(2/3)
x^(2/3) = 1/(2^(2/3))
x^(2/3) = 1/(2^(2/3)) // ^ 3
x^2 = 1/4 // ^ 1/2
abs(x) = 1/2
x = 1/2 or x = -1/2
x in { 1/2, -1/2 }
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