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0.25r+9-0.05r=10.8
We move all terms to the left:
0.25r+9-0.05r-(10.8)=0
We add all the numbers together, and all the variables
0.2r-1.8=0
We move all terms containing r to the left, all other terms to the right
0.2r=1.8
r=1.8/0.2
r=9
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