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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1.2 = 2/X // - 2/X
1.2-(2/X) = 0
1.2-2*X^-1 = 0
-2*X^-1 = -1.2 // : -2
X^-1 = 0.6
-1 < 0
1/(X^1) = 0.6 // * X^1
1 = 0.6*X^1 // : 0.6
1.66666667 = X^1
X = 1.66666667
X = 1.66666667
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