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50.24=2*3.14r
We move all terms to the left:
50.24-(2*3.14r)=0
We add all the numbers together, and all the variables
-(+2*3.14r)+50.24=0
We get rid of parentheses
-2*3.14r+50.24=0
Wy multiply elements
-6r+50.24=0
We move all terms containing r to the left, all other terms to the right
-6r=-50.24
r=-50.24/-6
r=8+1/2.6785714285714
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