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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/10 = 5/x // - 5/x
16/10-(5/x) = 0
16/10-5*x^-1 = 0
-5*x^-1 = -8/5 // : -5
x^-1 = 8/25
-1 < 0
1/(x^1) = 8/25 // * x^1
1 = 8/25*x^1 // : 8/25
25/8 = x^1
x = 25/8
x = 25/8
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