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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
682/d = 21 // - 21
682/d-21 = 0
682*d^-1 = 21 // : 682
d^-1 = 21/682
-1 < 0
1/(d^1) = 21/682 // * d^1
1 = 21/682*d^1 // : 21/682
682/21 = d^1
d = 682/21
d = 682/21
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