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4+1.5r=17.5
We move all terms to the left:
4+1.5r-(17.5)=0
We add all the numbers together, and all the variables
1.5r-13.5=0
We move all terms containing r to the left, all other terms to the right
1.5r=13.5
r=13.5/1.5
r=9
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