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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
24/X+4 = 8/X // - 8/X
24/X-(8/X)+4 = 0
24/X-8*X^-1+4 = 0
16*X^-1 = -4 // : 16
X^-1 = -1/4
-1 < 0
1/(X^1) = -1/4 // * X^1
1 = -1/4*X^1 // : -1/4
-4 = X^1
X = -4
X = -4
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