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x in (-oo:+oo)
8/12 = (x-4)/20 // - (x-4)/20
8/12-((x-4)/20) = 0
(-1*(x-4))/20+2/3 = 0
(-1*3*(x-4))/(3*20)+(2*20)/(3*20) = 0
2*20-1*3*(x-4) = 0
52-3*x = 0
(52-3*x)/(3*20) = 0
(52-3*x)/(3*20) = 0 // * 3*20
52-3*x = 0
52-3*x = 0 // - 52
-3*x = -52 // : -3
x = -52/(-3)
x = 52/3
x = 52/3
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