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2n+9=12+n
We move all terms to the left:
2n+9-(12+n)=0
We add all the numbers together, and all the variables
2n-(n+12)+9=0
We get rid of parentheses
2n-n-12+9=0
We add all the numbers together, and all the variables
n-3=0
We move all terms containing n to the left, all other terms to the right
n=3
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