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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
8 = 1000000/X // - 1000000/X
8-(1000000/X) = 0
8-1000000*X^-1 = 0
-1000000*X^-1 = -8 // : -1000000
X^-1 = 1/125000
-1 < 0
1/(X^1) = 1/125000 // * X^1
1 = 1/125000*X^1 // : 1/125000
125000 = X^1
X = 125000
X = 125000
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