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2r-3=9+4r-5r
We move all terms to the left:
2r-3-(9+4r-5r)=0
We add all the numbers together, and all the variables
2r-(-1r+9)-3=0
We get rid of parentheses
2r+1r-9-3=0
We add all the numbers together, and all the variables
3r-12=0
We move all terms containing r to the left, all other terms to the right
3r=12
r=12/3
r=4
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