30=6.28*r

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Solution for 30=6.28*r equation: 



30=6.28r

We move all terms to the left:

30-(6.28r)=0

We add all the numbers together, and all the variables

-(+6.28r)+30=0

We get rid of parentheses

-6.28r+30=0

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

-6.28r=-30

r=-30/-6.28

r=4+1.6944444444444/2.1805555555556

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