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D( x )
(2*x-5)^2 = 0
(2*x-5)^2 = 0
(2*x-5)^2 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
-11/((2*x-5)^2) = 0
-11 = 0
x belongs to the empty set
x belongs to the empty set
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