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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
14/X = 126 // - 126
14/X-126 = 0
14*X^-1 = 126 // : 14
X^-1 = 9
-1 < 0
1/(X^1) = 9 // * X^1
1 = 9*X^1 // : 9
1/9 = X^1
X = 1/9
X = 1/9
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