n+3n=28

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Solution for n+3n=28 equation: 



n+3n=28

We move all terms to the left:

n+3n-(28)=0

We add all the numbers together, and all the variables

4n-28=0

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

4n=28

n=28/4

n=7

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