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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
0.48/X = 0.8 // - 0.8
0.48/X-0.8 = 0
0.48*X^-1 = 0.8 // : 0.48
X^-1 = 1.66666667
-1 < 0
1/(X^1) = 1.66666667 // * X^1
1 = 1.66666667*X^1 // : 1.66666667
0.6 = X^1
X = 0.6
X = 0.6
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