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5n-13=3n+9
We move all terms to the left:
5n-13-(3n+9)=0
We get rid of parentheses
5n-3n-9-13=0
We add all the numbers together, and all the variables
2n-22=0
We move all terms containing n to the left, all other terms to the right
2n=22
n=22/2
n=11
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