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K in (-oo:+oo)
K/5 = 10/18 // - 10/18
K/5-(10/18) = 0
K/5-5/9 = 0
1/5*K-5/9 = 0 // + 5/9
1/5*K = 5/9 // : 1/5
K = 5/9/1/5
K = 25/9
K = 25/9
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