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D( r )
r-1 = 0
r-1 = 0
r-1 = 0
r-1 = 0 // + 1
r = 1
r in (-oo:1) U (1:+oo)
(r-4)/(r-1) = 0
r-4 = 0 // + 4
r = 4
r = 4
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