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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
100/1.2 = 3456/X // - 3456/X
100/1.2-(3456/X) = 0
100/1.2-3456*X^-1 = 0
-3456*X^-1 = -83.33333333 // : -3456
X^-1 = 0.02411265
-1 < 0
1/(X^1) = 0.02411265 // * X^1
1 = 0.02411265*X^1 // : 0.02411265
41.47200743 = X^1
X = 41.47200743
X = 41.47200743
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