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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
149000 = 1/X // - 1/X
149000-(1/X) = 0
149000-X^-1 = 0
-1*X^-1 = -149000 // : -1
X^-1 = 149000
-1 < 0
1/(X^1) = 149000 // * X^1
1 = 149000*X^1 // : 149000
1/149000 = X^1
X = 1/149000
X = 1/149000
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