9=n-4n

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Solution for 9=n-4n equation: 



9=n-4n

We move all terms to the left:

9-(n-4n)=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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