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x in (-oo:+oo)
3*((1/12)*x+8) = (1/4)*x+6+18 // - (1/4)*x+6+18
3*((1/12)*x+8)-((1/4)*x)-18-6 = 0
3*((1/12)*x+8)+(-1/4)*x-18-6 = 0
3*(1/12*x+8)-x/4-18-6 = 0
(3*4*(1/12*x+8))/4-x/4+(-18*4)/4+(-6*4)/4 = 0
3*4*(1/12*x+8)-x-18*4-6*4 = 0
96-72-24 = 0
24-24 = 0
0 = 0
0/4 = 0
0/4 = 0 // * 4
0 = 0
x belongs to the empty set
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