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r+7.41r=3.13
We move all terms to the left:
r+7.41r-(3.13)=0
We add all the numbers together, and all the variables
8.41r-3.13=0
We move all terms containing r to the left, all other terms to the right
8.41r=3.13
r=3.13/8.41
r=2.7699115044248/7.4424778761062
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