2n+n=18

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Solution for 2n+n=18 equation: 



2n+n=18

We move all terms to the left:

2n+n-(18)=0

We add all the numbers together, and all the variables

3n-18=0

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

3n=18

n=18/3

n=6

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