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