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-7r-1=9r-17
We move all terms to the left:
-7r-1-(9r-17)=0
We get rid of parentheses
-7r-9r+17-1=0
We add all the numbers together, and all the variables
-16r+16=0
We move all terms containing r to the left, all other terms to the right
-16r=-16
r=-16/-16
r=1
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