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3n+9n+(-3n)-13n=16

We move all terms to the left:

3n+9n+(-3n)-13n-(16)=0

We add all the numbers together, and all the variables

-1n+(-3n)-16=0

We get rid of parentheses

-1n-3n-16=0

We add all the numbers together, and all the variables

-4n-16=0

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

-4n=16

n=16/-4

n=-4

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