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22=6.28r
We move all terms to the left:
22-(6.28r)=0
We add all the numbers together, and all the variables
-(+6.28r)+22=0
We get rid of parentheses
-6.28r+22=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-22
r=-22/-6.28
r=3+1/1.9873417721519
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