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0.3r=0.9
We move all terms to the left:
0.3r-(0.9)=0
We add all the numbers together, and all the variables
0.3r-0.9=0
We move all terms containing r to the left, all other terms to the right
0.3r=0.9
r=0.9/0.3
r=3+1.11022302463E-16/0.3
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