21=n+6

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Solution for 21=n+6 equation: 



21=n+6

We move all terms to the left:

21-(n+6)=0

We get rid of parentheses

-n-6+21=0

We add all the numbers together, and all the variables

-1n+15=0

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

-n=-15

n=-15/-1

n=+15

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