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2r-3=9r-4
We move all terms to the left:
2r-3-(9r-4)=0
We get rid of parentheses
2r-9r+4-3=0
We add all the numbers together, and all the variables
-7r+1=0
We move all terms containing r to the left, all other terms to the right
-7r=-1
r=-1/-7
r=1/7
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