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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
91.4/X = 103.2 // - 103.2
91.4/X-103.2 = 0
91.4*X^-1 = 103.2 // : 91.4
X^-1 = 1.12910284
-1 < 0
1/(X^1) = 1.12910284 // * X^1
1 = 1.12910284*X^1 // : 1.12910284
0.88565892 = X^1
X = 0.88565892
X = 0.88565892
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