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452.16=3.14r+r
We move all terms to the left:
452.16-(3.14r+r)=0
We add all the numbers together, and all the variables
-(+4.14r)+452.16=0
We get rid of parentheses
-4.14r+452.16=0
We move all terms containing r to the left, all other terms to the right
-4.14r=-452.16
r=-452.16/-4.14
r=109+0.90000000000003/4.14
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