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K in (-oo:+oo)
(K/12)*K = 72 // - 72
(K/12)*K-72 = 0
1/12*K^2 = 72 // : 1/12
K^2 = 864
K^2 = 864 // ^ 1/2
abs(K) = 12*6^(1/2)
K = 12*6^(1/2) or K = -(12*6^(1/2))
K in { 12*6^(1/2), -(12*6^(1/2)) }
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