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k in (-oo:+oo)
6*(8-4*k) = -168 // + 168
6*(8-4*k)+168 = 0
6*(8-4*k)+168 = 0
216-24*k = 0
216-24*k = 0
216-24*k = 0 // - 216
-24*k = -216 // : -24
k = -216/(-24)
k = 9
k = 9
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