r=-7+2r

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Solution for r=-7+2r equation: 



r=-7+2r

We move all terms to the left:

r-(-7+2r)=0

We add all the numbers together, and all the variables

r-(2r-7)=0

We get rid of parentheses

r-2r+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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