9=4n-n

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Solution for 9=4n-n equation: 



9=4n-n

We move all terms to the left:

9-(4n-n)=0

We add all the numbers together, and all the variables

-(+3n)+9=0

We get rid of parentheses

-3n+9=0

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

-3n=-9

n=-9/-3

n=+3

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