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69.1=2*3.14r
We move all terms to the left:
69.1-(2*3.14r)=0
We add all the numbers together, and all the variables
-(+2*3.14r)+69.1=0
We get rid of parentheses
-2*3.14r+69.1=0
Wy multiply elements
-6r+69.1=0
We move all terms containing r to the left, all other terms to the right
-6r=-69.1
r=-69.1/-6
r=11+1/1.9354838709677
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