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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
13/234 = 6/X // - 6/X
13/234-(6/X) = 0
13/234-6*X^-1 = 0
-6*X^-1 = -1/18 // : -6
X^-1 = 1/108
-1 < 0
1/(X^1) = 1/108 // * X^1
1 = 1/108*X^1 // : 1/108
108 = X^1
X = 108
X = 108
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