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x in (-oo:+oo)
(x+8)/12+(3/4)*x = 1 // - 1
(x+8)/12+(3/4)*x-1 = 0
(x+8)/12+(3*x)/4-1 = 0
(4*(x+8))/(4*12)+(3*12*x)/(4*12)+(-1*4*12)/(4*12) = 0
4*(x+8)+3*12*x-1*4*12 = 0
40*x-48+32 = 0
40*x-16 = 0
(40*x-16)/(4*12) = 0
(40*x-16)/(4*12) = 0 // * 4*12
40*x-16 = 0
40*x-16 = 0 // + 16
40*x = 16 // : 40
x = 16/40
x = 2/5
x = 2/5
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