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k in (-oo:+oo)
-(6*k)-9 = -15 // + 15
15-(6*k)-9 = 0
15-6*k-9 = 0
6-6*k = 0 // - 6
-6*k = -6 // : -6
k = -6/(-6)
k = 1
k = 1
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