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