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