21=7+n

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Solution for 21=7+n equation: 



21=7+n

We move all terms to the left:

21-(7+n)=0

We add all the numbers together, and all the variables

-(n+7)+21=0

We get rid of parentheses

-n-7+21=0

We add all the numbers together, and all the variables

-1n+14=0

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

-n=-14

n=-14/-1

n=+14

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