21=n+20

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Solution for 21=n+20 equation: 



21=n+20

We move all terms to the left:

21-(n+20)=0

We get rid of parentheses

-n-20+21=0

We add all the numbers together, and all the variables

-1n+1=0

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

-n=-1

n=-1/-1

n=1

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