21=n-3

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Solution for 21=n-3 equation: 



21=n-3

We move all terms to the left:

21-(n-3)=0

We get rid of parentheses

-n+3+21=0

We add all the numbers together, and all the variables

-1n+24=0

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

-n=-24

n=-24/-1

n=+24

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