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48.6=5.4r
We move all terms to the left:
48.6-(5.4r)=0
We add all the numbers together, and all the variables
-(+5.4r)+48.6=0
We get rid of parentheses
-5.4r+48.6=0
We move all terms containing r to the left, all other terms to the right
-5.4r=-48.6
r=-48.6/-5.4
r=+9
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