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7539.14=3.14r
We move all terms to the left:
7539.14-(3.14r)=0
We add all the numbers together, and all the variables
-(+3.14r)+7539.14=0
We get rid of parentheses
-3.14r+7539.14=0
We move all terms containing r to the left, all other terms to the right
-3.14r=-7539.14
r=-7539.14/-3.14
r=+2401
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