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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/8 = (6*x)/x // - (6*x)/x
6/8-((6*x)/x) = 0
6/8-6 = 0
-21/4 = 0
x belongs to the empty set
x belongs to the empty set
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