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k in (-oo:+oo)
k+8 = 6*k-12 // - 6*k-12
k-(6*k)+8+12 = 0
k-6*k+8+12 = 0
20-5*k = 0 // - 20
-5*k = -20 // : -5
k = -20/(-5)
k = 4
k = 4
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