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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
14/X = 5.84 // - 5.84
14/X-5.84 = 0
14*X^-1 = 5.84 // : 14
X^-1 = 0.41714286
-1 < 0
1/(X^1) = 0.41714286 // * X^1
1 = 0.41714286*X^1 // : 0.41714286
2.39726026 = X^1
X = 2.39726026
X = 2.39726026
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