21=4n+7n

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Solution for 21=4n+7n equation: 



21=4n+7n

We move all terms to the left:

21-(4n+7n)=0

We add all the numbers together, and all the variables

-(+11n)+21=0

We get rid of parentheses

-11n+21=0

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

-11n=-21

n=-21/-11

n=1+10/11

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