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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
2/25 = 24/d // - 24/d
2/25-(24/d) = 0
2/25-24*d^-1 = 0
-24*d^-1 = -2/25 // : -24
d^-1 = 1/300
-1 < 0
1/(d^1) = 1/300 // * d^1
1 = 1/300*d^1 // : 1/300
300 = d^1
d = 300
d = 300
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