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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
104 = 8/d // - 8/d
104-(8/d) = 0
104-8*d^-1 = 0
-8*d^-1 = -104 // : -8
d^-1 = 13
-1 < 0
1/(d^1) = 13 // * d^1
1 = 13*d^1 // : 13
1/13 = d^1
d = 1/13
d = 1/13
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