84=7n-3n

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Solution for 84=7n-3n equation: 



84=7n-3n

We move all terms to the left:

84-(7n-3n)=0

We add all the numbers together, and all the variables

-(+4n)+84=0

We get rid of parentheses

-4n+84=0

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

-4n=-84

n=-84/-4

n=+21

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