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k in (-oo:+oo)
6 = 6*k-(3*k)-9 // - 6*k-(3*k)-9
3*k-(6*k)+6+9 = 0
3*k-6*k+6+9 = 0
15-3*k = 0 // - 15
-3*k = -15 // : -3
k = -15/(-3)
k = 5
k = 5
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