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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
0.009/X = 0.01 // - 0.01
0.009/X-0.01 = 0
0.009*X^-1 = 0.01 // : 0.009
X^-1 = 1.11111111
-1 < 0
1/(X^1) = 1.11111111 // * X^1
1 = 1.11111111*X^1 // : 1.11111111
0.9 = X^1
X = 0.9
X = 0.9
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