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d in (-oo:+oo)
4/3 = d/384 // - d/384
4/3-(d/384) = 0
4/3-1/384*d = 0 // - 4/3
-1/384*d = -4/3 // : -1/384
d = -4/3/(-1/384)
d = 512
d = 512
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