n+3n+n+3n-3n=20

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Solution for n+3n+n+3n-3n=20 equation: 



n+3n+n+3n-3n=20

We move all terms to the left:

n+3n+n+3n-3n-(20)=0

We add all the numbers together, and all the variables

5n-20=0

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

5n=20

n=20/5

n=4

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