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K in (-oo:+oo)
K^2 = 25/36 // - 25/36
K^2-(25/36) = 0
K^2-25/36 = 0
1*K^2 = 25/36 // : 1
K^2 = 25/36
K^2 = 25/36 // ^ 1/2
abs(K) = 5/6
K = 5/6 or K = -5/6
K in { 5/6, -5/6 }
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