12+3n=18+n

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Solution for 12+3n=18+n equation: 



12+3n=18+n

We move all terms to the left:

12+3n-(18+n)=0

We add all the numbers together, and all the variables

3n-(n+18)+12=0

We get rid of parentheses

3n-n-18+12=0

We add all the numbers together, and all the variables

2n-6=0

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

2n=6

n=6/2

n=3

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