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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9-(x/x) = 0.2 // - 0.2
9-(x/x)-0.2 = 0
9-1-0.2 = 0
7.8 = 0
x belongs to the empty set
x belongs to the empty set
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