7=r-8r

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Solution for 7=r-8r equation: 



7=r-8r

We move all terms to the left:

7-(r-8r)=0

We add all the numbers together, and all the variables

-(-7r)+7=0

We get rid of parentheses

7r+7=0

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

7r=-7

r=-7/7

r=-1

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