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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
9/d = 27/39 // - 27/39
9/d-(27/39) = 0
9/d-9/13 = 0
9*d^-1 = 9/13 // : 9
d^-1 = 1/13
-1 < 0
1/(d^1) = 1/13 // * d^1
1 = 1/13*d^1 // : 1/13
13 = d^1
d = 13
d = 13
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