9=n+15

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Solution for 9=n+15 equation: 



9=n+15

We move all terms to the left:

9-(n+15)=0

We get rid of parentheses

-n-15+9=0

We add all the numbers together, and all the variables

-1n-6=0

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

-n=6

n=6/-1

n=-6

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