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18.84=6.28r
We move all terms to the left:
18.84-(6.28r)=0
We add all the numbers together, and all the variables
-(+6.28r)+18.84=0
We get rid of parentheses
-6.28r+18.84=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-18.84
r=-18.84/-6.28
r=+3
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