21-3n=4n

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Solution for 21-3n=4n equation: 



21-3n=4n

We move all terms to the left:

21-3n-(4n)=0

We add all the numbers together, and all the variables

-7n+21=0

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

-7n=-21

n=-21/-7

n=+3

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