12.56=3.14r

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Solution for 12.56=3.14r equation: 



12.56=3.14r

We move all terms to the left:

12.56-(3.14r)=0

We add all the numbers together, and all the variables

-(+3.14r)+12.56=0

We get rid of parentheses

-3.14r+12.56=0

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

-3.14r=-12.56

r=-12.56/-3.14

r=+4

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