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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
9/X = 18/1360 // - 18/1360
9/X-(18/1360) = 0
9/X-9/680 = 0
9*X^-1 = 9/680 // : 9
X^-1 = 1/680
-1 < 0
1/(X^1) = 1/680 // * X^1
1 = 1/680*X^1 // : 1/680
680 = X^1
X = 680
X = 680
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