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K in (-oo:+oo)
(1/4)*K = 3/5 // - 3/5
(1/4)*K-(3/5) = 0
(1/4)*K-3/5 = 0
1/4*K-3/5 = 0 // + 3/5
1/4*K = 3/5 // : 1/4
K = 3/5/1/4
K = 12/5
K = 12/5
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