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k in (-oo:+oo)
(k-4)/5 = 12 // - 12
(k-4)/5-12 = 0
(k-4)/5+(-12*5)/5 = 0
k-12*5-4 = 0
k-64 = 0
(k-64)/5 = 0
(k-64)/5 = 0 // * 5
k-64 = 0
k-64 = 0 // + 64
k = 64
k = 64
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