3n=9+15

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Solution for 3n=9+15 equation: 



3n=9+15

We move all terms to the left:

3n-(9+15)=0

We add all the numbers together, and all the variables

3n-24=0

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

3n=24

n=24/3

n=8

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