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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
8/d-(3/5) = 0
8/d-3/5 = 0
8*d^-1 = 3/5 // : 8
d^-1 = 3/40
-1 < 0
1/(d^1) = 3/40 // * d^1
1 = 3/40*d^1 // : 3/40
40/3 = d^1
d = 40/3
d = 40/3
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