30=2r-r

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Solution for 30=2r-r equation: 



30=2r-r

We move all terms to the left:

30-(2r-r)=0

We add all the numbers together, and all the variables

-(+r)+30=0

We get rid of parentheses

-r+30=0

We add all the numbers together, and all the variables

-1r+30=0

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

-r=-30

r=-30/-1

r=+30

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