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23(r+9)=23r+207
We move all terms to the left:
23(r+9)-(23r+207)=0
We multiply parentheses
23r-(23r+207)+207=0
We get rid of parentheses
23r-23r-207+207=0
We add all the numbers together, and all the variables
=0
r=0/1
r=0
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