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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1/X = 300/650 // - 300/650
1/X-(300/650) = 0
1/X-6/13 = 0
1*X^-1 = 6/13 // : 1
X^-1 = 6/13
-1 < 0
1/(X^1) = 6/13 // * X^1
1 = 6/13*X^1 // : 6/13
13/6 = X^1
X = 13/6
X = 13/6
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