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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(3*x-15)/(x-5) = 0
3*x-15 = 0 // + 15
3*x = 15 // : 3
x = 15/3
x = 5
x in { 5}
x belongs to the empty set
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