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(10n-15)=3n+13
We move all terms to the left:
(10n-15)-(3n+13)=0
We get rid of parentheses
10n-3n-15-13=0
We add all the numbers together, and all the variables
7n-28=0
We move all terms containing n to the left, all other terms to the right
7n=28
n=28/7
n=4
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