12=20-4n

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Solution for 12=20-4n equation: 



12=20-4n

We move all terms to the left:

12-(20-4n)=0

We add all the numbers together, and all the variables

-(-4n+20)+12=0

We get rid of parentheses

4n-20+12=0

We add all the numbers together, and all the variables

4n-8=0

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

4n=8

n=8/4

n=2

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