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D( x )
x-8 = 0
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:8) U (8:+oo)
(x-4)/(x-8) = 0
x-4 = 0 // + 4
x = 4
x = 4
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