3n+n=40

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Solution for 3n+n=40 equation: 



3n+n=40

We move all terms to the left:

3n+n-(40)=0

We add all the numbers together, and all the variables

4n-40=0

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

4n=40

n=40/4

n=10

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