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20.16=6.3r
We move all terms to the left:
20.16-(6.3r)=0
We add all the numbers together, and all the variables
-(+6.3r)+20.16=0
We get rid of parentheses
-6.3r+20.16=0
We move all terms containing r to the left, all other terms to the right
-6.3r=-20.16
r=-20.16/-6.3
r=3+1/5
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