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