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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
3/7 = 18/d // - 18/d
3/7-(18/d) = 0
3/7-18*d^-1 = 0
-18*d^-1 = -3/7 // : -18
d^-1 = 1/42
-1 < 0
1/(d^1) = 1/42 // * d^1
1 = 1/42*d^1 // : 1/42
42 = d^1
d = 42
d = 42
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