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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
128/d = 16 // - 16
128/d-16 = 0
128*d^-1 = 16 // : 128
d^-1 = 1/8
-1 < 0
1/(d^1) = 1/8 // * d^1
1 = 1/8*d^1 // : 1/8
8 = d^1
d = 8
d = 8
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