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K in (-oo:+oo)
(5/2)*K = 5/4 // - 5/4
(5/2)*K-(5/4) = 0
(5/2)*K-5/4 = 0
5/2*K-5/4 = 0 // + 5/4
5/2*K = 5/4 // : 5/2
K = 5/4/5/2
K = 1/2
K = 1/2
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