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5n+5=3n+15
We move all terms to the left:
5n+5-(3n+15)=0
We get rid of parentheses
5n-3n-15+5=0
We add all the numbers together, and all the variables
2n-10=0
We move all terms containing n to the left, all other terms to the right
2n=10
n=10/2
n=5
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