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-2.17=9.35r
We move all terms to the left:
-2.17-(9.35r)=0
We add all the numbers together, and all the variables
-(+9.35r)-2.17=0
We get rid of parentheses
-9.35r-2.17=0
We move all terms containing r to the left, all other terms to the right
-9.35r=2.17
r=2.17/-9.35
r=-2.17/9.35
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