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9-5r=18.5
We move all terms to the left:
9-5r-(18.5)=0
We add all the numbers together, and all the variables
-5r-9.5=0
We move all terms containing r to the left, all other terms to the right
-5r=9.5
r=9.5/-5
r=-1+3/3.3333333333333
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