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k in (-oo:+oo)
6-(k/14)+7 = 3/7 // - 3/7
6-(k/14)-(3/7)+7 = 0
6-(k/14)-3/7+7 = 0
88/7-1/14*k = 0 // - 88/7
-1/14*k = -88/7 // : -1/14
k = -88/7/(-1/14)
k = 176
k = 176
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