-13=7+n

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Solution for -13=7+n equation: 



-13=7+n

We move all terms to the left:

-13-(7+n)=0

We add all the numbers together, and all the variables

-(n+7)-13=0

We get rid of parentheses

-n-7-13=0

We add all the numbers together, and all the variables

-1n-20=0

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

-n=20

n=20/-1

n=-20

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