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10.25r+10.25r+61.5=42.5
We move all terms to the left:
10.25r+10.25r+61.5-(42.5)=0
We add all the numbers together, and all the variables
20.5r+19=0
We move all terms containing r to the left, all other terms to the right
20.5r=-19
r=-19/20.5
r=-19/20.5
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