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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
16/d = 1/2 // - 1/2
16/d-(1/2) = 0
16/d-1/2 = 0
16*d^-1 = 1/2 // : 16
d^-1 = 1/32
-1 < 0
1/(d^1) = 1/32 // * d^1
1 = 1/32*d^1 // : 1/32
32 = d^1
d = 32
d = 32
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