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d in (-oo:+oo)
(1*(1/4))/2 = 4*d // - 4*d
(1*(1/4))/2-(4*d) = 0
(1/4)/2-4*d = 0
1/8-4*d = 0 // - 1/8
-4*d = -1/8 // : -4
d = -1/8/(-4)
d = 1/32
d = 1/32
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