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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4/X-5 = 5 // - 5
4/X-5-5 = 0
4*X^-1 = 10 // : 4
X^-1 = 5/2
-1 < 0
1/(X^1) = 5/2 // * X^1
1 = 5/2*X^1 // : 5/2
2/5 = X^1
X = 2/5
X = 2/5
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