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3-8r-9+11r=r+12
We move all terms to the left:
3-8r-9+11r-(r+12)=0
We add all the numbers together, and all the variables
3r-(r+12)-6=0
We get rid of parentheses
3r-r-12-6=0
We add all the numbers together, and all the variables
2r-18=0
We move all terms containing r to the left, all other terms to the right
2r=18
r=18/2
r=9
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