8r=-9-r

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Solution for 8r=-9-r equation: 



8r=-9-r

We move all terms to the left:

8r-(-9-r)=0

We add all the numbers together, and all the variables

8r-(-1r-9)=0

We get rid of parentheses

8r+1r+9=0

We add all the numbers together, and all the variables

9r+9=0

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

9r=-9

r=-9/9

r=-1

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