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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
102/X = 8 // - 8
102/X-8 = 0
102*X^-1 = 8 // : 102
X^-1 = 4/51
-1 < 0
1/(X^1) = 4/51 // * X^1
1 = 4/51*X^1 // : 4/51
51/4 = X^1
X = 51/4
X = 51/4
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