20=3r-7

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Solution for 20=3r-7 equation: 



20=3r-7

We move all terms to the left:

20-(3r-7)=0

We get rid of parentheses

-3r+7+20=0

We add all the numbers together, and all the variables

-3r+27=0

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

-3r=-27

r=-27/-3

r=+9

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