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r in (-oo:+oo)
(2*r+16)/6 = (3*r-12)/3 // - (3*r-12)/3
(2*r+16)/6-((3*r-12)/3) = 0
(2*r+16)/6+(-1*(3*r-12))/3 = 0
(3*(2*r+16))/(3*6)+(-1*6*(3*r-12))/(3*6) = 0
3*(2*r+16)-1*6*(3*r-12) = 0
120-12*r = 0
(120-12*r)/(3*6) = 0
(120-12*r)/(3*6) = 0 // * 3*6
120-12*r = 0
120-12*r = 0 // - 120
-12*r = -120 // : -12
r = -120/(-12)
r = 10
r = 10
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