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r in (-oo:+oo)
(2*r)/6+12/6 = (4*r)/4-(24/4) // - (4*r)/4-(24/4)
(2*r)/6-((4*r)/4)+12/6+24/4 = 0
(2*r)/6-r+12/6+24/4 = 0
8-2/3*r = 0 // - 8
-2/3*r = -8 // : -2/3
r = -8/(-2/3)
r = 12
r = 12
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