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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x+7 = 5/4 // - 5/4
x/x-(5/4)+7 = 0
x/x-5/4+7 = 0
27/4 = 0
x belongs to the empty set
x belongs to the empty set
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