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45r-11=9r-42
We move all terms to the left:
45r-11-(9r-42)=0
We get rid of parentheses
45r-9r+42-11=0
We add all the numbers together, and all the variables
36r+31=0
We move all terms containing r to the left, all other terms to the right
36r=-31
r=-31/36
r=-31/36
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