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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/5 = x/x-3 // - x/x-3
2/5-(x/x)+3 = 0
2/5-1+3 = 0
12/5 = 0
x belongs to the empty set
x belongs to the empty set
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