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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-9 = 2/6 // - 2/6
x/x-(2/6)-9 = 0
x/x-1/3-9 = 0
-25/3 = 0
x belongs to the empty set
x belongs to the empty set
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