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1+2n=8+7n-3-6n
We move all terms to the left:
1+2n-(8+7n-3-6n)=0
We add all the numbers together, and all the variables
2n-(n+5)+1=0
We get rid of parentheses
2n-n-5+1=0
We add all the numbers together, and all the variables
n-4=0
We move all terms containing n to the left, all other terms to the right
n=4
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