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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
8/d = 1/d-(3/d)+2 // - 1/d-(3/d)+2
8/d-(1/d)+3/d-2 = 0
8/d-d^-1+3/d-2 = 0
10*d^-1 = 2 // : 10
d^-1 = 1/5
-1 < 0
1/(d^1) = 1/5 // * d^1
1 = 1/5*d^1 // : 1/5
5 = d^1
d = 5
d = 5
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