-20=13+n

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Solution for -20=13+n equation: 



-20=13+n

We move all terms to the left:

-20-(13+n)=0

We add all the numbers together, and all the variables

-(n+13)-20=0

We get rid of parentheses

-n-13-20=0

We add all the numbers together, and all the variables

-1n-33=0

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

-n=33

n=33/-1

n=-33

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