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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
24/8 = 3/X // - 3/X
24/8-(3/X) = 0
24/8-3*X^-1 = 0
-3*X^-1 = -3 // : -3
X^-1 = 1
-1 < 0
1/(X^1) = 1 // * X^1
1 = 1*X^1 // : 1
1 = X^1
X = 1
X = 1
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