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9(2r+1)=54
We move all terms to the left:
9(2r+1)-(54)=0
We multiply parentheses
18r+9-54=0
We add all the numbers together, and all the variables
18r-45=0
We move all terms containing r to the left, all other terms to the right
18r=45
r=45/18
r=2+1/2
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