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R in (-oo:+oo)
R/2.6 = -1.2 // + 1.2
R/2.6+1.2 = 0
0.38461538*R+1.2 = 0 // - 1.2
0.38461538*R = -1.2 // : 0.38461538
R = -1.2/0.38461538
R = -3.12000004
R = -3.12000004
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