2(3.14159265359)r=82

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Solution for 2(3.14159265359)r=82 equation: 



2(3.14159265359)r=82

We move all terms to the left:

2(3.14159265359)r-(82)=0

We multiply parentheses

6.28318530718r-82=0

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

6.28318530718r=82

r=82/6.28318530718

r=13+0.31859100666/6.28318530718

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