12=3n-7n

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Solution for 12=3n-7n equation: 



12=3n-7n

We move all terms to the left:

12-(3n-7n)=0

We add all the numbers together, and all the variables

-(-4n)+12=0

We get rid of parentheses

4n+12=0

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

4n=-12

n=-12/4

n=-3

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