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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
14/X = 3.5 // - 3.5
14/X-3.5 = 0
14*X^-1 = 3.5 // : 14
X^-1 = 0.25
-1 < 0
1/(X^1) = 0.25 // * X^1
1 = 0.25*X^1 // : 0.25
4 = X^1
X = 4
X = 4
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