27*3.1416=2*3.1416*r^2*r

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Solution for 27*3.1416=2*3.1416*r^2*r equation: 



27*3.1416=2*3.1416r^2r

We move all terms to the left:

27*3.1416-(2*3.1416r^2r)=0

We add all the numbers together, and all the variables

-(2*3.1416r^2r)+84.8232=0

We get rid of parentheses

-2*3.1416r^2r+84.8232=0

Wy multiply elements

-6r+84.8232=0

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

-6r=-84.8232

r=-84.8232/-6

r=14+0.8232/6

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