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-2(1+6k)=-86
We move all terms to the left:
-2(1+6k)-(-86)=0
We add all the numbers together, and all the variables
-2(6k+1)-(-86)=0
We add all the numbers together, and all the variables
-2(6k+1)+86=0
We multiply parentheses
-12k-2+86=0
We add all the numbers together, and all the variables
-12k+84=0
We move all terms containing k to the left, all other terms to the right
-12k=-84
k=-84/-12
k=+7
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