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k in (-oo:+oo)
(k+2)/7 = -2 // + 2
(k+2)/7+2 = 0
(k+2)/7+(2*7)/7 = 0
k+2*7+2 = 0
k+16 = 0
(k+16)/7 = 0
(k+16)/7 = 0 // * 7
k+16 = 0
k+16 = 0 // - 16
k = -16
k = -16
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