9=-7n-2n

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Solution for 9=-7n-2n equation: 



9=-7n-2n

We move all terms to the left:

9-(-7n-2n)=0

We add all the numbers together, and all the variables

-(-9n)+9=0

We get rid of parentheses

9n+9=0

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

9n=-9

n=-9/9

n=-1

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