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-2(6k+6)=-84
We move all terms to the left:
-2(6k+6)-(-84)=0
We add all the numbers together, and all the variables
-2(6k+6)+84=0
We multiply parentheses
-12k-12+84=0
We add all the numbers together, and all the variables
-12k+72=0
We move all terms containing k to the left, all other terms to the right
-12k=-72
k=-72/-12
k=+6
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