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-2(7-7k)+8k=40+4k
We move all terms to the left:
-2(7-7k)+8k-(40+4k)=0
We add all the numbers together, and all the variables
-2(-7k+7)+8k-(4k+40)=0
We add all the numbers together, and all the variables
8k-2(-7k+7)-(4k+40)=0
We multiply parentheses
8k+14k-(4k+40)-14=0
We get rid of parentheses
8k+14k-4k-40-14=0
We add all the numbers together, and all the variables
18k-54=0
We move all terms containing k to the left, all other terms to the right
18k=54
k=54/18
k=3
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