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k in (-oo:+oo)
(k-4)/3 = 3 // - 3
(k-4)/3-3 = 0
(k-4)/3+(-3*3)/3 = 0
k-3*3-4 = 0
k-13 = 0
(k-13)/3 = 0
(k-13)/3 = 0 // * 3
k-13 = 0
k-13 = 0 // + 13
k = 13
k = 13
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