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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
5/18 = 25/d // - 25/d
5/18-(25/d) = 0
5/18-25*d^-1 = 0
-25*d^-1 = -5/18 // : -25
d^-1 = 1/90
-1 < 0
1/(d^1) = 1/90 // * d^1
1 = 1/90*d^1 // : 1/90
90 = d^1
d = 90
d = 90
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