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30.8=4.4r
We move all terms to the left:
30.8-(4.4r)=0
We add all the numbers together, and all the variables
-(+4.4r)+30.8=0
We get rid of parentheses
-4.4r+30.8=0
We move all terms containing r to the left, all other terms to the right
-4.4r=-30.8
r=-30.8/-4.4
r=7+-3.5527136788005E-15/4.4
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