19.5=2*3.14*r

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Solution for 19.5=2*3.14*r equation: 



19.5=2*3.14*r

We move all terms to the left:

19.5-(2*3.14*r)=0

We add all the numbers together, and all the variables

-(+2*3.14*r)+19.5=0

We get rid of parentheses

-2*3.14*r+19.5=0

Wy multiply elements

-6.28r+19.5=0

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

-6.28r=-19.5

r=-19.5/-6.28

r=3+0.66/6.28

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