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r in (-oo:+oo)
(3*r)/8.1 = 22.8 // - 22.8
(3*r)/8.1-22.8 = 0
0.37037037*r-22.8 = 0 // + 22.8
0.37037037*r = 22.8 // : 0.37037037
r = 22.8/0.37037037
r = 61.56000006
r = 61.56000006
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