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8n-(2n+7)=42
We move all terms to the left:
8n-(2n+7)-(42)=0
We get rid of parentheses
8n-2n-7-42=0
We add all the numbers together, and all the variables
6n-49=0
We move all terms containing n to the left, all other terms to the right
6n=49
n=49/6
n=8+1/6
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