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D( x )
2*x-8 = 0
2*x-8 = 0
2*x-8 = 0
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x in (-oo:4) U (4:+oo)
5/(2*x-8) = 0
x belongs to the empty set
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