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10r=3.14
We move all terms to the left:
10r-(3.14)=0
We add all the numbers together, and all the variables
10r-3.14=0
We move all terms containing r to the left, all other terms to the right
10r=3.14
r=3.14/10
r=2.7543859649123/8.7719298245614
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