12+3n=40

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Solution for 12+3n=40 equation: 



12+3n=40

We move all terms to the left:

12+3n-(40)=0

We add all the numbers together, and all the variables

3n-28=0

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

3n=28

n=28/3

n=9+1/3

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