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3800=3.14r*20592
We move all terms to the left:
3800-(3.14r*20592)=0
We add all the numbers together, and all the variables
-(+3.14r*20592)+3800=0
We get rid of parentheses
-3.14r*20592+3800=0
We move all terms containing r to the left, all other terms to the right
-3.14r*20592=-3800
r=-3800/1
r=-3800
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