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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1.2/X = 9/6 // - 9/6
1.2/X-(9/6) = 0
1.2/X-3/2 = 0
1.2*X^-1 = 3/2 // : 1.2
X^-1 = 1.25
-1 < 0
1/(X^1) = 1.25 // * X^1
1 = 1.25*X^1 // : 1.25
0.8 = X^1
X = 0.8
X = 0.8
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