4(n-20)=20

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Solution for 4(n-20)=20 equation: 



4(n-20)=20

We move all terms to the left:

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

We multiply parentheses

4n-80-20=0

We add all the numbers together, and all the variables

4n-100=0

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

4n=100

n=100/4

n=25

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