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6=6.28r

We move all terms to the left:

6-(6.28r)=0

We add all the numbers together, and all the variables

-(+6.28r)+6=0

We get rid of parentheses

-6.28r+6=0

We move all terms containing r to the left, all other terms to the right

-6.28r=-6

r=-6/-6.28

r=1/1.0466666666667

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