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-9-11r=16+10r+17
We move all terms to the left:
-9-11r-(16+10r+17)=0
We add all the numbers together, and all the variables
-11r-(10r+33)-9=0
We get rid of parentheses
-11r-10r-33-9=0
We add all the numbers together, and all the variables
-21r-42=0
We move all terms containing r to the left, all other terms to the right
-21r=42
r=42/-21
r=-2
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