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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
-0.222222222/X = 0.4 // - 0.4
-0.222222222/X-0.4 = 0
-0.222222222*X^-1 = 0.4 // : -0.222222222
X^-1 = -1.8
-1 < 0
1/(X^1) = -1.8 // * X^1
1 = -1.8*X^1 // : -1.8
-0.55555556 = X^1
X = -0.55555556
X = -0.55555556
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