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127=8r-9
We move all terms to the left:
127-(8r-9)=0
We get rid of parentheses
-8r+9+127=0
We add all the numbers together, and all the variables
-8r+136=0
We move all terms containing r to the left, all other terms to the right
-8r=-136
r=-136/-8
r=+17
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