2n-9=-n

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Solution for 2n-9=-n equation: 



2n-9=-n

We move all terms to the left:

2n-9-(-n)=0

We add all the numbers together, and all the variables

2n-(-1n)-9=0

We get rid of parentheses

2n+1n-9=0

We add all the numbers together, and all the variables

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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