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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
800 = 2500/X // - 2500/X
800-(2500/X) = 0
800-2500*X^-1 = 0
-2500*X^-1 = -800 // : -2500
X^-1 = 8/25
-1 < 0
1/(X^1) = 8/25 // * X^1
1 = 8/25*X^1 // : 8/25
25/8 = X^1
X = 25/8
X = 25/8
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