6.28=3.14*r*r*2

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Solution for 6.28=3.14*r*r*2 equation: 



6.28=3.14r*r*2

We move all terms to the left:

6.28-(3.14r*r*2)=0

We add all the numbers together, and all the variables

-(+3.14r*r*2)+6.28=0

We get rid of parentheses

-3.14r*r*2+6.28=0

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

-3.14r*r*2=-6.28

r=-6.28/1

r=-6.28

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