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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-3 = 6/7 // - 6/7
x/x-(6/7)-3 = 0
x/x-6/7-3 = 0
-20/7 = 0
x belongs to the empty set
x belongs to the empty set
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