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D( x )
5-(2*x) = 0
5-(2*x) = 0
5-(2*x) = 0
5-2*x = 0
5-2*x = 0 // - 5
-2*x = -5 // : -2
x = -5/(-2)
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
(4*x-1)/(5-(2*x)) = 0
(4*x-1)/(5-2*x) = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x = 1/4
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