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r in (-oo:+oo)
r/2.7 = 5.6/6.3 // - 5.6/6.3
r/2.7-(5.6/6.3) = 0
r/2.7-0.88888889 = 0
0.37037037*r-0.88888889 = 0 // + 0.88888889
0.37037037*r = 0.88888889 // : 0.37037037
r = 0.88888889/0.37037037
r = 2.40000001
r = 2.40000001
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