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D( r )
r-11 = 0
r-11 = 0
r-11 = 0
r-11 = 0 // + 11
r = 11
r in (-oo:11) U (11:+oo)
6/(r-11) = 3/11 // - 3/11
6/(r-11)-(3/11) = 0
6/(r-11)-3/11 = 0
(6*11)/(11*(r-11))+(-3*(r-11))/(11*(r-11)) = 0
6*11-3*(r-11) = 0
99-3*r = 0
(99-3*r)/(11*(r-11)) = 0
(99-3*r)/(11*(r-11)) = 0 // * 11*(r-11)
99-3*r = 0
99-3*r = 0 // - 99
-3*r = -99 // : -3
r = -99/(-3)
r = 33
r = 33
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