r-20=-3r+20+20

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Solution for r-20=-3r+20+20 equation: 



r-20=-3r+20+20

We move all terms to the left:

r-20-(-3r+20+20)=0

We add all the numbers together, and all the variables

r-(-3r+40)-20=0

We get rid of parentheses

r+3r-40-20=0

We add all the numbers together, and all the variables

4r-60=0

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

4r=60

r=60/4

r=15

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