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0.5r=0.2
We move all terms to the left:
0.5r-(0.2)=0
We add all the numbers together, and all the variables
0.5r-0.2=0
We move all terms containing r to the left, all other terms to the right
0.5r=0.2
r=0.2/0.5
r=0.2/0.5
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