9=-4+n

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Solution for 9=-4+n equation: 



9=-4+n

We move all terms to the left:

9-(-4+n)=0

We add all the numbers together, and all the variables

-(n-4)+9=0

We get rid of parentheses

-n+4+9=0

We add all the numbers together, and all the variables

-1n+13=0

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

-n=-13

n=-13/-1

n=+13

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