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D( d )
-d = 0
-d = 0
d = 0
d in (-oo:0) U (0:+oo)
55/10 = 11/(-d) // - 11/(-d)
55/10-(11/(-d)) = 0
11*d^-1+55/10 = 0
11*d^-1 = -11/2 // : 11
d^-1 = -1/2
-1 < 0
1/(d^1) = -1/2 // * d^1
1 = -1/2*d^1 // : -1/2
-2 = d^1
d = -2
d = -2
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