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K in (-oo:+oo)
K/24 = 12/80 // - 12/80
K/24-(12/80) = 0
K/24-3/20 = 0
1/24*K-3/20 = 0 // + 3/20
1/24*K = 3/20 // : 1/24
K = 3/20/1/24
K = 18/5
K = 18/5
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