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