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5n-(n+9)=3
We move all terms to the left:
5n-(n+9)-(3)=0
We get rid of parentheses
5n-n-9-3=0
We add all the numbers together, and all the variables
4n-12=0
We move all terms containing n to the left, all other terms to the right
4n=12
n=12/4
n=3
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