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K in (-oo:+oo)
K/5 = 15/5 // - 15/5
K/5-(15/5) = 0
K/5-3 = 0
1/5*K-3 = 0 // + 3
1/5*K = 3 // : 1/5
K = 3/1/5
K = 15
K = 15
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