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d in (-oo:+oo)
(4*d+3)/8 = -2 // + 2
(4*d+3)/8+2 = 0
(4*d+3)/8+(2*8)/8 = 0
4*d+2*8+3 = 0
4*d+19 = 0
(4*d+19)/8 = 0
(4*d+19)/8 = 0 // * 8
4*d+19 = 0
4*d+19 = 0 // - 19
4*d = -19 // : 4
d = -19/4
d = -19/4
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