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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
310/2 = 333/X // - 333/X
310/2-(333/X) = 0
310/2-333*X^-1 = 0
-333*X^-1 = -155 // : -333
X^-1 = 155/333
-1 < 0
1/(X^1) = 155/333 // * X^1
1 = 155/333*X^1 // : 155/333
333/155 = X^1
X = 333/155
X = 333/155
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