9+n=4n+15

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Solution for 9+n=4n+15 equation: 



9+n=4n+15

We move all terms to the left:

9+n-(4n+15)=0

We get rid of parentheses

n-4n-15+9=0

We add all the numbers together, and all the variables

-3n-6=0

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

-3n=6

n=6/-3

n=-2

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