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2(2c+7)=42
We move all terms to the left:
2(2c+7)-(42)=0
We multiply parentheses
4c+14-42=0
We add all the numbers together, and all the variables
4c-28=0
We move all terms containing c to the left, all other terms to the right
4c=28
c=28/4
c=7
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