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k in (-oo:+oo)
-(3*k)-6 = -9 // + 9
9-(3*k)-6 = 0
9-3*k-6 = 0
3-3*k = 0 // - 3
-3*k = -3 // : -3
k = -3/(-3)
k = 1
k = 1
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