4n+5+n=20

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Solution for 4n+5+n=20 equation: 



4n+5+n=20

We move all terms to the left:

4n+5+n-(20)=0

We add all the numbers together, and all the variables

5n-15=0

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

5n=15

n=15/5

n=3

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