3n-12+4n=9

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Solution for 3n-12+4n=9 equation: 



3n-12+4n=9

We move all terms to the left:

3n-12+4n-(9)=0

We add all the numbers together, and all the variables

7n-21=0

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

7n=21

n=21/7

n=3

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