(3n+9)=5n-12-n

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Solution for (3n+9)=5n-12-n equation: 



(3n+9)=5n-12-n

We move all terms to the left:

(3n+9)-(5n-12-n)=0

We add all the numbers together, and all the variables

(3n+9)-(4n-12)=0

We get rid of parentheses

3n-4n+9+12=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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