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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-(x/x) = 7/3 // - 7/3
5-(x/x)-(7/3) = 0
5-7/3-1 = 0
5/3 = 0
x belongs to the empty set
x belongs to the empty set
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