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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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