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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4/X = 3/9 // - 3/9
4/X-(3/9) = 0
4/X-1/3 = 0
4*X^-1 = 1/3 // : 4
X^-1 = 1/12
-1 < 0
1/(X^1) = 1/12 // * X^1
1 = 1/12*X^1 // : 1/12
12 = X^1
X = 12
X = 12
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