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