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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(3*x-12)/(x-4) = 0
3*x-12 = 0 // + 12
3*x = 12 // : 3
x = 12/3
x = 4
x in { 4}
x belongs to the empty set
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