3n=120-n

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Solution for 3n=120-n equation: 



3n=120-n

We move all terms to the left:

3n-(120-n)=0

We add all the numbers together, and all the variables

3n-(-1n+120)=0

We get rid of parentheses

3n+1n-120=0

We add all the numbers together, and all the variables

4n-120=0

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

4n=120

n=120/4

n=30

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