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36r-2.5=12r-4.5
We move all terms to the left:
36r-2.5-(12r-4.5)=0
We get rid of parentheses
36r-12r+4.5-2.5=0
We add all the numbers together, and all the variables
24r+2=0
We move all terms containing r to the left, all other terms to the right
24r=-2
r=-2/24
r=-1/12
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