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k in (-oo:+oo)
(k-7)/8 = 5 // - 5
(k-7)/8-5 = 0
(k-7)/8+(-5*8)/8 = 0
k-5*8-7 = 0
k-47 = 0
(k-47)/8 = 0
(k-47)/8 = 0 // * 8
k-47 = 0
k-47 = 0 // + 47
k = 47
k = 47
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