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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
6/8 = 3/d // - 3/d
6/8-(3/d) = 0
6/8-3*d^-1 = 0
-3*d^-1 = -3/4 // : -3
d^-1 = 1/4
-1 < 0
1/(d^1) = 1/4 // * d^1
1 = 1/4*d^1 // : 1/4
4 = d^1
d = 4
d = 4
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