4(2r+1)=20

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Solution for 4(2r+1)=20 equation: 



4(2r+1)=20

We move all terms to the left:

4(2r+1)-(20)=0

We multiply parentheses

8r+4-20=0

We add all the numbers together, and all the variables

8r-16=0

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

8r=16

r=16/8

r=2

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