-8r=9-7r

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Solution for -8r=9-7r equation: 



-8r=9-7r

We move all terms to the left:

-8r-(9-7r)=0

We add all the numbers together, and all the variables

-8r-(-7r+9)=0

We get rid of parentheses

-8r+7r-9=0

We add all the numbers together, and all the variables

-1r-9=0

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

-r=9

r=9/-1

r=-9

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