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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
9/4 = 11.7/X // - 11.7/X
9/4-(11.7/X) = 0
9/4-11.7*X^-1 = 0
-11.7*X^-1 = -9/4 // : -11.7
X^-1 = 0.19230769
-1 < 0
1/(X^1) = 0.19230769 // * X^1
1 = 0.19230769*X^1 // : 0.19230769
5.20000006 = X^1
X = 5.20000006
X = 5.20000006
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