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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-9 = 2/7 // - 2/7
x/x-(2/7)-9 = 0
x/x-2/7-9 = 0
-58/7 = 0
x belongs to the empty set
x belongs to the empty set
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