4(r-4)=20

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



4(r-4)=20

We move all terms to the left:

4(r-4)-(20)=0

We multiply parentheses

4r-16-20=0

We add all the numbers together, and all the variables

4r-36=0

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

4r=36

r=36/4

r=9

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