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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/9 = x/x-3 // - x/x-3
10/9-(x/x)+3 = 0
10/9-1+3 = 0
28/9 = 0
x belongs to the empty set
x belongs to the empty set
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