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r in (-oo:+oo)
r/4.7 = 18/14.1 // - 18/14.1
r/4.7-(18/14.1) = 0
r/4.7-1.27659574 = 0
0.21276596*r-1.27659574 = 0 // + 1.27659574
0.21276596*r = 1.27659574 // : 0.21276596
r = 1.27659574/0.21276596
r = 5.99999991
r = 5.99999991
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