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2641=3.14r
We move all terms to the left:
2641-(3.14r)=0
We add all the numbers together, and all the variables
-(+3.14r)+2641=0
We get rid of parentheses
-3.14r+2641=0
We move all terms containing r to the left, all other terms to the right
-3.14r=-2641
r=-2641/-3.14
r=841+0.25999999999976/3.14
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