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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)
(8*x-9)/(x-8) = 0
8*x-9 = 0 // + 9
8*x = 9 // : 8
x = 9/8
x = 9/8
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