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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
18/24 = 6/d // - 6/d
18/24-(6/d) = 0
18/24-6*d^-1 = 0
-6*d^-1 = -3/4 // : -6
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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