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9+5r=8r-9
We move all terms to the left:
9+5r-(8r-9)=0
We get rid of parentheses
5r-8r+9+9=0
We add all the numbers together, and all the variables
-3r+18=0
We move all terms containing r to the left, all other terms to the right
-3r=-18
r=-18/-3
r=+6
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