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r in (-oo:+oo)
(r+6)/3 = (r+8)/6 // - (r+8)/6
(r+6)/3-((r+8)/6) = 0
(r+6)/3+(-1*(r+8))/6 = 0
(6*(r+6))/(3*6)+(-1*3*(r+8))/(3*6) = 0
6*(r+6)-1*3*(r+8) = 0
3*r+12 = 0
(3*r+12)/(3*6) = 0
(3*r+12)/(3*6) = 0 // * 3*6
3*r+12 = 0
3*r+12 = 0 // - 12
3*r = -12 // : 3
r = -12/3
r = -4
r = -4
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