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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
1/d = 9/54 // - 9/54
1/d-(9/54) = 0
1/d-1/6 = 0
1*d^-1 = 1/6 // : 1
d^-1 = 1/6
-1 < 0
1/(d^1) = 1/6 // * d^1
1 = 1/6*d^1 // : 1/6
6 = d^1
d = 6
d = 6
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