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