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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
468/X = 3/5 // - 3/5
468/X-(3/5) = 0
468/X-3/5 = 0
468*X^-1 = 3/5 // : 468
X^-1 = 1/780
-1 < 0
1/(X^1) = 1/780 // * X^1
1 = 1/780*X^1 // : 1/780
780 = X^1
X = 780
X = 780
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