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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
3/1 = 123/X // - 123/X
3/1-(123/X) = 0
3-123*X^-1 = 0
-123*X^-1 = -3 // : -123
X^-1 = 1/41
-1 < 0
1/(X^1) = 1/41 // * X^1
1 = 1/41*X^1 // : 1/41
41 = X^1
X = 41
X = 41
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