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k in (-oo:+oo)
(k-7)/5 = 12 // - 12
(k-7)/5-12 = 0
(k-7)/5+(-12*5)/5 = 0
k-12*5-7 = 0
k-67 = 0
(k-67)/5 = 0
(k-67)/5 = 0 // * 5
k-67 = 0
k-67 = 0 // + 67
k = 67
k = 67
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