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d in (-oo:+oo)
d/(-6.4) = 0.85 // - 0.85
d/(-6.4)-0.85 = 0
-0.15625*d-0.85 = 0 // + 0.85
-0.15625*d = 0.85 // : -0.15625
d = 0.85/(-0.15625)
d = -5.44
d = -5.44
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