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k in (-oo:+oo)
6-4*k-(4*k) = 14 // - 14
6-4*k-(4*k)-14 = 0
6-4*k-4*k-14 = 0
-8*k-8 = 0 // + 8
-8*k = 8 // : -8
k = 8/(-8)
k = -1
k = -1
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