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Answer:
-3k²-12k-9 = 0
-3k²-3k-9k-9 = 0
-3k(k+1)-9(k+1) = 0
(k+1)(-3k-9) = 0
k+1 = 0
k = -1
-3k-9 = 0
-3k = 9
k = 9/-3
k = -3
k = -1,-3
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