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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
2.5/X = 12/16 // - 12/16
2.5/X-(12/16) = 0
2.5/X-3/4 = 0
2.5*X^-1 = 3/4 // : 2.5
X^-1 = 0.3
-1 < 0
1/(X^1) = 0.3 // * X^1
1 = 0.3*X^1 // : 0.3
3.33333333 = X^1
X = 3.33333333
X = 3.33333333
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