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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-2 = 9/5 // - 9/5
x/x-(9/5)-2 = 0
x/x-9/5-2 = 0
-14/5 = 0
x belongs to the empty set
x belongs to the empty set
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