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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/x-1 = 30/9 // - 30/9
(5*x)/x-(30/9)-1 = 0
(5*x)/x-10/3-1 = 0
2/3 = 0
x belongs to the empty set
x belongs to the empty set
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