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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
45/d = 5 // - 5
45/d-5 = 0
45*d^-1 = 5 // : 45
d^-1 = 1/9
-1 < 0
1/(d^1) = 1/9 // * d^1
1 = 1/9*d^1 // : 1/9
9 = d^1
d = 9
d = 9
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