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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4078/X = 2.39 // - 2.39
4078/X-2.39 = 0
4078*X^-1 = 2.39 // : 4078
X^-1 = 0.00058607
-1 < 0
1/(X^1) = 0.00058607 // * X^1
1 = 0.00058607*X^1 // : 0.00058607
1706.2808197 = X^1
X = 1706.2808197
X = 1706.2808197
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