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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
0.92 = 10.1/X // - 10.1/X
0.92-(10.1/X) = 0
0.92-10.1*X^-1 = 0
-10.1*X^-1 = -0.92 // : -10.1
X^-1 = 0.09108911
-1 < 0
1/(X^1) = 0.09108911 // * X^1
1 = 0.09108911*X^1 // : 0.09108911
10.97826074 = X^1
X = 10.97826074
X = 10.97826074
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