4=20-n

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Solution for 4=20-n equation: 



4=20-n

We move all terms to the left:

4-(20-n)=0

We add all the numbers together, and all the variables

-(-1n+20)+4=0

We get rid of parentheses

1n-20+4=0

We add all the numbers together, and all the variables

n-16=0

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

n=16

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