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d in (-oo:+oo)
d/2.5-3.4 = 4.6 // - 4.6
d/2.5-4.6-3.4 = 0
0.4*d-8 = 0 // + 8
0.4*d = 8 // : 0.4
d = 8/0.4
d = 20
d = 20
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