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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)
(4*x+11)/(x-8) = 0
4*x+11 = 0 // - 11
4*x = -11 // : 4
x = -11/4
x = -11/4
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