12=2(n-9)

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Solution for 12=2(n-9) equation: 



12=2(n-9)

We move all terms to the left:

12-(2(n-9))=0



We calculate terms in parentheses: -(2(n-9)), so:

2(n-9)

We multiply parentheses

2n-18

Back to the equation:

-(2n-18)



We get rid of parentheses

-2n+18+12=0

We add all the numbers together, and all the variables

-2n+30=0

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

-2n=-30

n=-30/-2

n=+15

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