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r=6.8*2*3.14
We move all terms to the left:
r-(6.8*2*3.14)=0
We add all the numbers together, and all the variables
r-(42.704)=0
We add all the numbers together, and all the variables
r-42.704=0
We move all terms containing r to the left, all other terms to the right
r=42.704
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