2(3.14)=r

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Solution for 2(3.14)=r equation: 



2(3.14)=r

We move all terms to the left:

2(3.14)-(r)=0

We add all the numbers together, and all the variables

-1r+6.28=0

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

-r=-6.28

r=-6.28/-1

r=6+0.28/1

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