-2n=n+9

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Solution for -2n=n+9 equation: 



-2n=n+9

We move all terms to the left:

-2n-(n+9)=0

We get rid of parentheses

-2n-n-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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