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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
100*(91.4/X) = 103.2 // - 103.2
100*(91.4/X)-103.2 = 0
9140*X^-1 = 103.2 // : 9140
X^-1 = 0.01129103
-1 < 0
1/(X^1) = 0.01129103 // * X^1
1 = 0.01129103*X^1 // : 0.01129103
88.56587929 = X^1
X = 88.56587929
X = 88.56587929
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