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0.7r=2.1
We move all terms to the left:
0.7r-(2.1)=0
We add all the numbers together, and all the variables
0.7r-2.1=0
We move all terms containing r to the left, all other terms to the right
0.7r=2.1
r=2.1/0.7
r=3+4.4408920985E-16/0.7
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