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r in (-oo:+oo)
(4*r+24)/12 = (4*r-32)/4 // - (4*r-32)/4
(4*r+24)/12-((4*r-32)/4) = 0
(4*r+24)/12+(-1*(4*r-32))/4 = 0
(4*(4*r+24))/(4*12)+(-1*12*(4*r-32))/(4*12) = 0
4*(4*r+24)-1*12*(4*r-32) = 0
480-32*r = 0
(480-32*r)/(4*12) = 0
(480-32*r)/(4*12) = 0 // * 4*12
480-32*r = 0
480-32*r = 0 // - 480
-32*r = -480 // : -32
r = -480/(-32)
r = 15
r = 15
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