138=n+n

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Solution for 138=n+n equation: 



138=n+n

We move all terms to the left:

138-(n+n)=0

We add all the numbers together, and all the variables

-(+2n)+138=0

We get rid of parentheses

-2n+138=0

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

-2n=-138

n=-138/-2

n=+69

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