138=20n-2

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Solution for 138=20n-2 equation: 



138=20n-2

We move all terms to the left:

138-(20n-2)=0

We get rid of parentheses

-20n+2+138=0

We add all the numbers together, and all the variables

-20n+140=0

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

-20n=-140

n=-140/-20

n=+7

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