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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
4/d = 12 // - 12
4/d-12 = 0
4*d^-1 = 12 // : 4
d^-1 = 3
-1 < 0
1/(d^1) = 3 // * d^1
1 = 3*d^1 // : 3
1/3 = d^1
d = 1/3
d = 1/3
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