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K in (-oo:+oo)
K^(2/3) = 3 // - 3
K^(2/3)-3 = 0
1*K^(2/3) = 3 // : 1
K^(2/3) = 3
K^(2/3) = 3 // ^ 3
K^2 = 27 // ^ 1/2
abs(K) = 3*3^(1/2)
K = 3*3^(1/2) or K = -(3*3^(1/2))
K in { 3*3^(1/2), -(3*3^(1/2)) }
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