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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
36/104 = 9/d // - 9/d
36/104-(9/d) = 0
36/104-9*d^-1 = 0
-9*d^-1 = -9/26 // : -9
d^-1 = 1/26
-1 < 0
1/(d^1) = 1/26 // * d^1
1 = 1/26*d^1 // : 1/26
26 = d^1
d = 26
d = 26
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