13=3n+n

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Solution for 13=3n+n equation: 



13=3n+n

We move all terms to the left:

13-(3n+n)=0

We add all the numbers together, and all the variables

-(+4n)+13=0

We get rid of parentheses

-4n+13=0

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

-4n=-13

n=-13/-4

n=3+1/4

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