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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
2/X = 12/48 // - 12/48
2/X-(12/48) = 0
2/X-1/4 = 0
2*X^-1 = 1/4 // : 2
X^-1 = 1/8
-1 < 0
1/(X^1) = 1/8 // * X^1
1 = 1/8*X^1 // : 1/8
8 = X^1
X = 8
X = 8
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