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