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x in (-oo:+oo)
(3/4)*(x+4)+(1/4)*x = 5 // - 5
(3/4)*(x+4)+(1/4)*x-5 = 0
3/4*(x+4)+x/4-5 = 0
(3/4*4*(x+4))/4+x/4+(-5*4)/4 = 0
3/4*4*(x+4)+x-5*4 = 0
4*x-20+12 = 0
4*x-8 = 0
(4*x-8)/4 = 0
(4*x-8)/4 = 0 // * 4
4*x-8 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x = 2
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