12=5n+7n

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Solution for 12=5n+7n equation: 



12=5n+7n

We move all terms to the left:

12-(5n+7n)=0

We add all the numbers together, and all the variables

-(+12n)+12=0

We get rid of parentheses

-12n+12=0

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

-12n=-12

n=-12/-12

n=1

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