4=n-9

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Solution for 4=n-9 equation: 



4=n-9

We move all terms to the left:

4-(n-9)=0

We get rid of parentheses

-n+9+4=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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