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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
14/50 = 48/X // - 48/X
14/50-(48/X) = 0
14/50-48*X^-1 = 0
-48*X^-1 = -7/25 // : -48
X^-1 = 7/1200
-1 < 0
1/(X^1) = 7/1200 // * X^1
1 = 7/1200*X^1 // : 7/1200
1200/7 = X^1
X = 1200/7
X = 1200/7
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