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8.5-3r=8r
We move all terms to the left:
8.5-3r-(8r)=0
We add all the numbers together, and all the variables
-11r+8.5=0
We move all terms containing r to the left, all other terms to the right
-11r=-8.5
r=-8.5/-11
r=5.6666666666667/7.3333333333333
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