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15n=6+13n
We move all terms to the left:
15n-(6+13n)=0
We add all the numbers together, and all the variables
15n-(13n+6)=0
We get rid of parentheses
15n-13n-6=0
We add all the numbers together, and all the variables
2n-6=0
We move all terms containing n to the left, all other terms to the right
2n=6
n=6/2
n=3
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