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k in (-oo:+oo)
8/7 = k/12 // - k/12
8/7-(k/12) = 0
8/7-1/12*k = 0 // - 8/7
-1/12*k = -8/7 // : -1/12
k = -8/7/(-1/12)
k = 96/7
k = 96/7
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