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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
4/9 = 36/d // - 36/d
4/9-(36/d) = 0
4/9-36*d^-1 = 0
-36*d^-1 = -4/9 // : -36
d^-1 = 1/81
-1 < 0
1/(d^1) = 1/81 // * d^1
1 = 1/81*d^1 // : 1/81
81 = d^1
d = 81
d = 81
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