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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14-(x/x) = 15/21 // - 15/21
14-(x/x)-(15/21) = 0
14-5/7-1 = 0
86/7 = 0
x belongs to the empty set
x belongs to the empty set
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