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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
54/d = 9/13 // - 9/13
54/d-(9/13) = 0
54/d-9/13 = 0
54*d^-1 = 9/13 // : 54
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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