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5r-9=2r+9
We move all terms to the left:
5r-9-(2r+9)=0
We get rid of parentheses
5r-2r-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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