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7n-15=4n+9
We move all terms to the left:
7n-15-(4n+9)=0
We get rid of parentheses
7n-4n-9-15=0
We add all the numbers together, and all the variables
3n-24=0
We move all terms containing n to the left, all other terms to the right
3n=24
n=24/3
n=8
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