20=n+13

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Solution for 20=n+13 equation: 



20=n+13

We move all terms to the left:

20-(n+13)=0

We get rid of parentheses

-n-13+20=0

We add all the numbers together, and all the variables

-1n+7=0

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

-n=-7

n=-7/-1

n=+7

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