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5(n+3)+2(n-4)=49
We move all terms to the left:
5(n+3)+2(n-4)-(49)=0
We multiply parentheses
5n+2n+15-8-49=0
We add all the numbers together, and all the variables
7n-42=0
We move all terms containing n to the left, all other terms to the right
7n=42
n=42/7
n=6
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