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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
4.5/X = 9/10 // - 9/10
4.5/X-(9/10) = 0
4.5/X-9/10 = 0
4.5*X^-1 = 9/10 // : 4.5
X^-1 = 0.2
-1 < 0
1/(X^1) = 0.2 // * X^1
1 = 0.2*X^1 // : 0.2
5 = X^1
X = 5
X = 5
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