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-9-3r=r-1
We move all terms to the left:
-9-3r-(r-1)=0
We get rid of parentheses
-3r-r+1-9=0
We add all the numbers together, and all the variables
-4r-8=0
We move all terms containing r to the left, all other terms to the right
-4r=8
r=8/-4
r=-2
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