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