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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
-1/d = 12 // - 12
-1/d-12 = 0
-1*d^-1 = 12 // : -1
d^-1 = -12
-1 < 0
1/(d^1) = -12 // * d^1
1 = -12*d^1 // : -12
-1/12 = d^1
d = -1/12
d = -1/12
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