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9(3+7k)=+k
We move all terms to the left:
9(3+7k)-(+k)=0
We add all the numbers together, and all the variables
9(7k+3)-(+k)=0
We multiply parentheses
63k-(+k)+27=0
We get rid of parentheses
63k-k+27=0
We add all the numbers together, and all the variables
62k+27=0
We move all terms containing k to the left, all other terms to the right
62k=-27
k=-27/62
k=-27/62
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