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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
6/d = 3 // - 3
6/d-3 = 0
6*d^-1 = 3 // : 6
d^-1 = 1/2
-1 < 0
1/(d^1) = 1/2 // * d^1
1 = 1/2*d^1 // : 1/2
2 = d^1
d = 2
d = 2
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