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r in (-oo:+oo)
(3*r+24)/9 = (4*r-32)/4 // - (4*r-32)/4
(3*r+24)/9-((4*r-32)/4) = 0
(3*r+24)/9+(-1*(4*r-32))/4 = 0
(4*(3*r+24))/(4*9)+(-1*9*(4*r-32))/(4*9) = 0
4*(3*r+24)-1*9*(4*r-32) = 0
384-24*r = 0
(384-24*r)/(4*9) = 0
(384-24*r)/(4*9) = 0 // * 4*9
384-24*r = 0
384-24*r = 0 // - 384
-24*r = -384 // : -24
r = -384/(-24)
r = 16
r = 16
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