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d in (-oo:+oo)
d/1.3 = 2.4 // - 2.4
d/1.3-2.4 = 0
0.76923077*d-2.4 = 0 // + 2.4
0.76923077*d = 2.4 // : 0.76923077
d = 2.4/0.76923077
d = 3.12
d = 3.12
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