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1+2n=5+4n+8
We move all terms to the left:
1+2n-(5+4n+8)=0
We add all the numbers together, and all the variables
2n-(4n+13)+1=0
We get rid of parentheses
2n-4n-13+1=0
We add all the numbers together, and all the variables
-2n-12=0
We move all terms containing n to the left, all other terms to the right
-2n=12
n=12/-2
n=-6
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