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d in (-oo:+oo)
1.25 = d/64 // - d/64
1.25-(d/64) = 0
1.25-1/64*d = 0 // - 1.25
-1/64*d = -1.25 // : -1/64
d = -1.25/(-1/64)
d = 80
d = 80
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