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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
1/5 = 108/d // - 108/d
1/5-(108/d) = 0
1/5-108*d^-1 = 0
-108*d^-1 = -1/5 // : -108
d^-1 = 1/540
-1 < 0
1/(d^1) = 1/540 // * d^1
1 = 1/540*d^1 // : 1/540
540 = d^1
d = 540
d = 540
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