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-12=6k+6+3k
We move all terms to the left:
-12-(6k+6+3k)=0
We add all the numbers together, and all the variables
-(9k+6)-12=0
We get rid of parentheses
-9k-6-12=0
We add all the numbers together, and all the variables
-9k-18=0
We move all terms containing k to the left, all other terms to the right
-9k=18
k=18/-9
k=-2
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