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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
-2 = -16/d // + -16/d
-(-16/d)-2 = 0
16*d^-1-2 = 0
16*d^-1 = 2 // : 16
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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