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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1000/X = 40 // - 40
1000/X-40 = 0
1000*X^-1 = 40 // : 1000
X^-1 = 1/25
-1 < 0
1/(X^1) = 1/25 // * X^1
1 = 1/25*X^1 // : 1/25
25 = X^1
X = 25
X = 25
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