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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
8/X = 32/20 // - 32/20
8/X-(32/20) = 0
8/X-8/5 = 0
8*X^-1 = 8/5 // : 8
X^-1 = 1/5
-1 < 0
1/(X^1) = 1/5 // * X^1
1 = 1/5*X^1 // : 1/5
5 = X^1
X = 5
X = 5
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