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k in (-oo:+oo)
k-(6*k)+6 = -14 // + 14
k-(6*k)+6+14 = 0
k-6*k+6+14 = 0
20-5*k = 0 // - 20
-5*k = -20 // : -5
k = -20/(-5)
k = 4
k = 4
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