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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4/X+3 = 24 // - 24
4/X-24+3 = 0
4*X^-1 = 21 // : 4
X^-1 = 21/4
-1 < 0
1/(X^1) = 21/4 // * X^1
1 = 21/4*X^1 // : 21/4
4/21 = X^1
X = 4/21
X = 4/21
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