21=4n-3n

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Solution for 21=4n-3n equation: 



21=4n-3n

We move all terms to the left:

21-(4n-3n)=0

We add all the numbers together, and all the variables

-(+n)+21=0

We get rid of parentheses

-n+21=0

We add all the numbers together, and all the variables

-1n+21=0

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

-n=-21

n=-21/-1

n=+21

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