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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
81/d = 54/52 // - 54/52
81/d-(54/52) = 0
81/d-27/26 = 0
81*d^-1 = 27/26 // : 81
d^-1 = 1/78
-1 < 0
1/(d^1) = 1/78 // * d^1
1 = 1/78*d^1 // : 1/78
78 = d^1
d = 78
d = 78
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