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-(3k+3)=-9-k
We move all terms to the left:
-(3k+3)-(-9-k)=0
We add all the numbers together, and all the variables
-(3k+3)-(-1k-9)=0
We get rid of parentheses
-3k+1k-3+9=0
We add all the numbers together, and all the variables
-2k+6=0
We move all terms containing k to the left, all other terms to the right
-2k=-6
k=-6/-2
k=+3
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