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K in (-oo:+oo)
(K-4)/9 = 3 // - 3
(K-4)/9-3 = 0
(K-4)/9+(-3*9)/9 = 0
K-3*9-4 = 0
K-31 = 0
(K-31)/9 = 0
(K-31)/9 = 0 // * 9
K-31 = 0
K-31 = 0 // + 31
K = 31
K = 31
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