3n+n=126

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Solution for 3n+n=126 equation: 



3n+n=126

We move all terms to the left:

3n+n-(126)=0

We add all the numbers together, and all the variables

4n-126=0

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

4n=126

n=126/4

n=31+1/2

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