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K in (-oo:+oo)
(K^2)/16 = 6 // - 6
(K^2)/16-6 = 0
1/16*K^2 = 6 // : 1/16
K^2 = 96
K^2 = 96 // ^ 1/2
abs(K) = 4*6^(1/2)
K = 4*6^(1/2) or K = -(4*6^(1/2))
K in { 4*6^(1/2), -(4*6^(1/2)) }
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