109=6r+28+21r

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Solution for 109=6r+28+21r equation: 



109=6r+28+21r

We move all terms to the left:

109-(6r+28+21r)=0

We add all the numbers together, and all the variables

-(27r+28)+109=0

We get rid of parentheses

-27r-28+109=0

We add all the numbers together, and all the variables

-27r+81=0

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

-27r=-81

r=-81/-27

r=+3

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