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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x-(5/16))*(6/x-1) = 0
(5*x-5/16)*(6/x-1) = 0
(5*x-5/16)*(6*x^-1-1) = 0
( 5*x-5/16 )
5*x-5/16 = 0 // + 5/16
5*x = 5/16 // : 5
x = 5/16/5
x = 1/16
( 6*x^-1-1 )
6*x^-1 = 1 // : 6
x^-1 = 1/6
-1 < 0
1/(x^1) = 1/6 // * x^1
1 = 1/6*x^1 // : 1/6
6 = x^1
x = 6
x in { 1/16, 6 }
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