13=13n-4n

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Solution for 13=13n-4n equation: 



13=13n-4n

We move all terms to the left:

13-(13n-4n)=0

We add all the numbers together, and all the variables

-(+9n)+13=0

We get rid of parentheses

-9n+13=0

We move all terms containing n to the left, all other terms to the right

-9n=-13

n=-13/-9

n=1+4/9

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