13+2n+n=40

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Solution for 13+2n+n=40 equation: 



13+2n+n=40

We move all terms to the left:

13+2n+n-(40)=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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