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d in (-oo:+oo)
d/1.3 = 2.6 // - 2.6
d/1.3-2.6 = 0
0.76923077*d-2.6 = 0 // + 2.6
0.76923077*d = 2.6 // : 0.76923077
d = 2.6/0.76923077
d = 3.38
d = 3.38
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