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113.4=6.28r
We move all terms to the left:
113.4-(6.28r)=0
We add all the numbers together, and all the variables
-(+6.28r)+113.4=0
We get rid of parentheses
-6.28r+113.4=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-113.4
r=-113.4/-6.28
r=18+0.36/6.28
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