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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8/5)*x*(6/x-8) = 0
8/5*x*(6*x^-1-8) = 0
( 6*x^-1-8 )
6*x^-1 = 8 // : 6
x^-1 = 4/3
-1 < 0
1/(x^1) = 4/3 // * x^1
1 = 4/3*x^1 // : 4/3
3/4 = x^1
x = 3/4
( 8/5*x )
8/5*x = 0 // : 8/5
x = 0
x in { 0}
x = 3/4
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