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25.1=6.28r
We move all terms to the left:
25.1-(6.28r)=0
We add all the numbers together, and all the variables
-(+6.28r)+25.1=0
We get rid of parentheses
-6.28r+25.1=0
We move all terms containing r to the left, all other terms to the right
-6.28r=-25.1
r=-25.1/-6.28
r=3+1/1.0031948881789
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