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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)
(4*x+8)/(x-3) = 0
4*x+8 = 0 // - 8
4*x = -8 // : 4
x = -8/4
x = -2
x = -2
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