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