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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
(1054.2-d)/d = 0.71 // - 0.71
(1054.2-d)/d-0.71 = 0
(1054.2-d)/d+(-0.71*d)/d = 0
1054.2-d-0.71*d = 0
1054.2-1.71*d = 0
(1054.2-1.71*d)/d = 0
(1054.2-1.71*d)/d = 0 // * d
1054.2-1.71*d = 0
1054.2-1.71*d = 0 // - 1054.2
-1.71*d = -1054.2 // : -1.71
d = -1054.2/(-1.71)
d = 616.49122807
d = 616.49122807
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