2n-12=9

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Solution for 2n-12=9 equation: 



2n-12=9

We move all terms to the left:

2n-12-(9)=0

We add all the numbers together, and all the variables

2n-21=0

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

2n=21

n=21/2

n=10+1/2

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