20=r-4+2r

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Solution for 20=r-4+2r equation: 



20=r-4+2r

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(3r-4)+20=0

We get rid of parentheses

-3r+4+20=0

We add all the numbers together, and all the variables

-3r+24=0

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

-3r=-24

r=-24/-3

r=+8

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