4n+15-7n-9=-21

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Solution for 4n+15-7n-9=-21 equation: 



4n+15-7n-9=-21

We move all terms to the left:

4n+15-7n-9-(-21)=0

We add all the numbers together, and all the variables

-3n+27=0

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

-3n=-27

n=-27/-3

n=+9

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