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D( x )
5*x-6 = 0
5*x-6 = 0
5*x-6 = 0
5*x-6 = 0 // + 6
5*x = 6 // : 5
x = 6/5
x in (-oo:6/5) U (6/5:+oo)
8/(5*x-6) = 0
8 = 0
x belongs to the empty set
x belongs to the empty set
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