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d in (-oo:+oo)
3/8 = d/6.4 // - d/6.4
3/8-(d/6.4) = 0
3/8-0.15625*d = 0
3/8-0.15625*d = 0 // - 3/8
-0.15625*d = -3/8 // : -0.15625
d = -3/8/(-0.15625)
d = 2.4
d = 2.4
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