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d in (-oo:+oo)
(1/4.1)/2 = 4*d // - 4*d
(1/4.1)/2-(4*d) = 0
(1/4.1)/2-4*d = 0
0.12195122-4*d = 0 // - 0.12195122
-4*d = -0.12195122 // : -4
d = -0.12195122/(-4)
d = 0.03048781
d = 0.03048781
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