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13n=15-2n
We move all terms to the left:
13n-(15-2n)=0
We add all the numbers together, and all the variables
13n-(-2n+15)=0
We get rid of parentheses
13n+2n-15=0
We add all the numbers together, and all the variables
15n-15=0
We move all terms containing n to the left, all other terms to the right
15n=15
n=15/15
n=1
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