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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
44/154 = 6/X // - 6/X
44/154-(6/X) = 0
44/154-6*X^-1 = 0
-6*X^-1 = -2/7 // : -6
X^-1 = 1/21
-1 < 0
1/(X^1) = 1/21 // * X^1
1 = 1/21*X^1 // : 1/21
21 = X^1
X = 21
X = 21
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