-2n-9=n+9

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Solution for -2n-9=n+9 equation: 



-2n-9=n+9

We move all terms to the left:

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

We get rid of parentheses

-2n-n-9-9=0

We add all the numbers together, and all the variables

-3n-18=0

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

-3n=18

n=18/-3

n=-6

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