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r/6=2.1
We move all terms to the left:
r/6-(2.1)=0
We add all the numbers together, and all the variables
r/6-2.1=0
We multiply all the terms by the denominator
r-(2.1)*6=0
We add all the numbers together, and all the variables
r-12.6=0
We move all terms containing r to the left, all other terms to the right
r=12.6
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