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9+4n=8n+1
We move all terms to the left:
9+4n-(8n+1)=0
We get rid of parentheses
4n-8n-1+9=0
We add all the numbers together, and all the variables
-4n+8=0
We move all terms containing n to the left, all other terms to the right
-4n=-8
n=-8/-4
n=+2
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