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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
24/5 = 3/X // - 3/X
24/5-(3/X) = 0
24/5-3*X^-1 = 0
-3*X^-1 = -24/5 // : -3
X^-1 = 8/5
-1 < 0
1/(X^1) = 8/5 // * X^1
1 = 8/5*X^1 // : 8/5
5/8 = X^1
X = 5/8
X = 5/8
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