2.17=2*3.14*r

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Solution for 2.17=2*3.14*r equation: 



2.17=2*3.14r

We move all terms to the left:

2.17-(2*3.14r)=0

We add all the numbers together, and all the variables

-(+2*3.14r)+2.17=0

We get rid of parentheses

-2*3.14r+2.17=0

Wy multiply elements

-6r+2.17=0

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

-6r=-2.17

r=-2.17/-6

r=1/2.7649769585253

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