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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4 = 5.6/X // - 5.6/X
4-(5.6/X) = 0
4-5.6*X^-1 = 0
-5.6*X^-1 = -4 // : -5.6
X^-1 = 0.71428571
-1 < 0
1/(X^1) = 0.71428571 // * X^1
1 = 0.71428571*X^1 // : 0.71428571
1.40000001 = X^1
X = 1.40000001
X = 1.40000001
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