4r+20=r

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Solution for 4r+20=r equation: 



4r+20=r

We move all terms to the left:

4r+20-(r)=0

We add all the numbers together, and all the variables

3r+20=0

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

3r=-20

r=-20/3

r=-6+2/3

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