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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(8-x)/(x-3) = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x = 8
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