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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
5-(r/r)-6 = 5/8 // - 5/8
5-(r/r)-(5/8)-6 = 0
5-5/8-6-1 = 0
-21/8 = 0
r belongs to the empty set
r belongs to the empty set
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