-13=7n+6n

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Solution for -13=7n+6n equation: 



-13=7n+6n

We move all terms to the left:

-13-(7n+6n)=0

We add all the numbers together, and all the variables

-(+13n)-13=0

We get rid of parentheses

-13n-13=0

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

-13n=13

n=13/-13

n=-1

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