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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/15-(x/x) = 2/3 // - 2/3
11/15-(x/x)-(2/3) = 0
11/15-2/3-1 = 0
-14/15 = 0
x belongs to the empty set
x belongs to the empty set
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