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k in (-oo:+oo)
((8*k)/6)*k = 8 // - 8
((8*k)/6)*k-8 = 0
4/3*k^2 = 8 // : 4/3
k^2 = 6
k^2 = 6 // ^ 1/2
abs(k) = 6^(1/2)
k = 6^(1/2) or k = -6^(1/2)
k in { 6^(1/2), -6^(1/2) }
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