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0.5r-3=12-4.5
We move all terms to the left:
0.5r-3-(12-4.5)=0
We add all the numbers together, and all the variables
0.5r-3-(7.5)=0
We add all the numbers together, and all the variables
0.5r-10.5=0
We move all terms containing r to the left, all other terms to the right
0.5r=10.5
r=10.5/0.5
r=21
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