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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
3/d = 18/3 // - 18/3
3/d-(18/3) = 0
3/d-6 = 0
3*d^-1 = 6 // : 3
d^-1 = 2
-1 < 0
1/(d^1) = 2 // * d^1
1 = 2*d^1 // : 2
1/2 = d^1
d = 1/2
d = 1/2
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