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-6(6k+7)+8k=-126
We move all terms to the left:
-6(6k+7)+8k-(-126)=0
We add all the numbers together, and all the variables
8k-6(6k+7)+126=0
We multiply parentheses
8k-36k-42+126=0
We add all the numbers together, and all the variables
-28k+84=0
We move all terms containing k to the left, all other terms to the right
-28k=-84
k=-84/-28
k=+3
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