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r+2.4r=16.8
We move all terms to the left:
r+2.4r-(16.8)=0
We add all the numbers together, and all the variables
3.4r-16.8=0
We move all terms containing r to the left, all other terms to the right
3.4r=16.8
r=16.8/3.4
r=4+1/1.0625
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