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20=3r-4
We move all terms to the left:
20-(3r-4)=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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