r=4+2r-8

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Solution for r=4+2r-8 equation: 



r=4+2r-8

We move all terms to the left:

r-(4+2r-8)=0

We add all the numbers together, and all the variables

r-(2r-4)=0

We get rid of parentheses

r-2r+4=0

We add all the numbers together, and all the variables

-1r+4=0

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

-r=-4

r=-4/-1

r=+4

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