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50.24=6.28r
We move all terms to the left:
50.24-(6.28r)=0
We add all the numbers together, and all the variables
-(+6.28r)+50.24=0
We get rid of parentheses
-6.28r+50.24=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-50.24
r=-50.24/-6.28
r=+8
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