7=2r-r

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Solution for 7=2r-r equation: 



7=2r-r

We move all terms to the left:

7-(2r-r)=0

We add all the numbers together, and all the variables

-(+r)+7=0

We get rid of parentheses

-r+7=0

We add all the numbers together, and all the variables

-1r+7=0

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

-r=-7

r=-7/-1

r=+7

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