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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
3 = 6/d // - 6/d
3-(6/d) = 0
3-6*d^-1 = 0
-6*d^-1 = -3 // : -6
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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