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k in (-oo:+oo)
7/2-(k/7) = 3/14 // - 3/14
7/2-(k/7)-(3/14) = 0
7/2-(k/7)-3/14 = 0
23/7-1/7*k = 0 // - 23/7
-1/7*k = -23/7 // : -1/7
k = -23/7/(-1/7)
k = 23
k = 23
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