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k in (-oo:+oo)
18 = 6*k+2*k-6 // - 6*k+2*k-6
6-(6*k)-(2*k)+18 = 0
6-6*k-2*k+18 = 0
24-8*k = 0 // - 24
-8*k = -24 // : -8
k = -24/(-8)
k = 3
k = 3
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