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3.9r=17.55
We move all terms to the left:
3.9r-(17.55)=0
We add all the numbers together, and all the variables
3.9r-17.55=0
We move all terms containing r to the left, all other terms to the right
3.9r=17.55
r=17.55/3.9
r=4+1/2
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