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2(3.14)r=102.6
We move all terms to the left:
2(3.14)r-(102.6)=0
We add all the numbers together, and all the variables
2(3.14)r-102.6=0
We multiply parentheses
6.28r-102.6=0
We move all terms containing r to the left, all other terms to the right
6.28r=102.6
r=102.6/6.28
r=16+1/2.96226415094
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