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R in (-oo:+oo)
R/2.6 = 1.3 // - 1.3
R/2.6-1.3 = 0
0.38461538*R-1.3 = 0 // + 1.3
0.38461538*R = 1.3 // : 0.38461538
R = 1.3/0.38461538
R = 3.38000004
R = 3.38000004
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