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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 5/2 // - 5/2
8/x-(5/2) = 0
8/x-5/2 = 0
8*x^-1 = 5/2 // : 8
x^-1 = 5/16
-1 < 0
1/(x^1) = 5/16 // * x^1
1 = 5/16*x^1 // : 5/16
16/5 = x^1
x = 16/5
x = 16/5
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