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d in (-oo:+oo)
-d/2 = 252-51508-491 // - 252-51508-491
491-d/2-252+51508 = 0
51747-1/2*d = 0 // - 51747
-1/2*d = -51747 // : -1/2
d = -51747/(-1/2)
d = 103494
d = 103494
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