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x in (-oo:+oo)
(x-4)/4-1 = (x-12)/5 // - (x-12)/5
(x-4)/4-((x-12)/5)-1 = 0
(x-4)/4+(-1*(x-12))/5-1 = 0
(5*(x-4))/(4*5)+(-1*4*(x-12))/(4*5)+(-1*4*5)/(4*5) = 0
5*(x-4)-1*4*(x-12)-1*4*5 = 0
x-20+28 = 0
x+8 = 0
(x+8)/(4*5) = 0
(x+8)/(4*5) = 0 // * 4*5
x+8 = 0
x+8 = 0 // - 8
x = -8
x = -8
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