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R in (-oo:+oo)
R/2.1 = 1.190476 // - 1.190476
R/2.1-1.190476 = 0
0.47619048*R-1.190476 = 0 // + 1.190476
0.47619048*R = 1.190476 // : 0.47619048
R = 1.190476/0.47619048
R = 2.49999958
R = 2.49999958
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