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k in (-oo:+oo)
21/14 = k/8 // - k/8
21/14-(k/8) = 0
3/2-1/8*k = 0 // - 3/2
-1/8*k = -3/2 // : -1/8
k = -3/2/(-1/8)
k = 12
k = 12
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