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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-6 = x/x+4 // - x/x+4
-(x/x)-6-4 = 0
-6-4-1 = 0
-11 = 0
x belongs to the empty set
x belongs to the empty set
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