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-8.8+7.7r=7.1
We move all terms to the left:
-8.8+7.7r-(7.1)=0
We add all the numbers together, and all the variables
7.7r-15.9=0
We move all terms containing r to the left, all other terms to the right
7.7r=15.9
r=15.9/7.7
r=2+0.5/7.7
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