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5(2n-)-(n+8)=13
We move all terms to the left:
5(2n-)-(n+8)-(13)=0
We add all the numbers together, and all the variables
5(+2n)-(n+8)-13=0
We multiply parentheses
10n-(n+8)-13=0
We get rid of parentheses
10n-n-8-13=0
We add all the numbers together, and all the variables
9n-21=0
We move all terms containing n to the left, all other terms to the right
9n=21
n=21/9
n=2+1/3
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