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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
24/4 = 18/X // - 18/X
24/4-(18/X) = 0
24/4-18*X^-1 = 0
-18*X^-1 = -6 // : -18
X^-1 = 1/3
-1 < 0
1/(X^1) = 1/3 // * X^1
1 = 1/3*X^1 // : 1/3
3 = X^1
X = 3
X = 3
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