4=20-2n

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Solution for 4=20-2n equation: 



4=20-2n

We move all terms to the left:

4-(20-2n)=0

We add all the numbers together, and all the variables

-(-2n+20)+4=0

We get rid of parentheses

2n-20+4=0

We add all the numbers together, and all the variables

2n-16=0

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

2n=16

n=16/2

n=8

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