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D( r )
2*r-1 = 0
2*r-1 = 0
2*r-1 = 0
2*r-1 = 0 // + 1
2*r = 1 // : 2
r = 1/2
r in (-oo:1/2) U (1/2:+oo)
(10*r)/(2*r-1) = 0
10*r = 0 // : 10
r = 0
r = 0
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