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4-2.33r+2.8=-20.314
We move all terms to the left:
4-2.33r+2.8-(-20.314)=0
We add all the numbers together, and all the variables
-2.33r+27.114=0
We move all terms containing r to the left, all other terms to the right
-2.33r=-27.114
r=-27.114/-2.33
r=11+1/1.5700808625337
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