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12r=40.5r-1
We move all terms to the left:
12r-(40.5r-1)=0
We get rid of parentheses
12r-40.5r+1=0
We add all the numbers together, and all the variables
-28.5r+1=0
We move all terms containing r to the left, all other terms to the right
-28.5r=-1
r=-1/-28.5
r=1/28.5
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