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x in (-oo:+oo)
(x+3)/1+(x+1)/4 = 4 // - 4
(x+3)/1+(x+1)/4-4 = 0
(x+1)/4+x-4+3 = 0
(x+1)/4+(4*x)/4+(-4*4)/4+(3*4)/4 = 0
x+4*x-4*4+3*4+1 = 0
5*x-16+1+12 = 0
5*x-15+12 = 0
5*x-3 = 0
(5*x-3)/4 = 0
(5*x-3)/4 = 0 // * 4
5*x-3 = 0
5*x-3 = 0 // + 3
5*x = 3 // : 5
x = 3/5
x = 3/5
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