7=n+20

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Solution for 7=n+20 equation: 



7=n+20

We move all terms to the left:

7-(n+20)=0

We get rid of parentheses

-n-20+7=0

We add all the numbers together, and all the variables

-1n-13=0

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

-n=13

n=13/-1

n=-13

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