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