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12.98r+0.083=13.48r-0.16
We move all terms to the left:
12.98r+0.083-(13.48r-0.16)=0
We get rid of parentheses
12.98r-13.48r+0.16+0.083=0
We add all the numbers together, and all the variables
-0.5r+0.243=0
We move all terms containing r to the left, all other terms to the right
-0.5r=-0.243
r=-0.243/-0.5
r=0.243/0.5
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