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-2.3r-1.33=6.72
We move all terms to the left:
-2.3r-1.33-(6.72)=0
We add all the numbers together, and all the variables
-2.3r-8.05=0
We move all terms containing r to the left, all other terms to the right
-2.3r=8.05
r=8.05/-2.3
r=-3+1/2
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