63=21+3n

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Solution for 63=21+3n equation: 



63=21+3n

We move all terms to the left:

63-(21+3n)=0

We add all the numbers together, and all the variables

-(3n+21)+63=0

We get rid of parentheses

-3n-21+63=0

We add all the numbers together, and all the variables

-3n+42=0

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

-3n=-42

n=-42/-3

n=+14

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