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D( x )
x-9 = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:9) U (9:+oo)
((x-9)*(x-8))/(x-9) = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x = 8
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