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x in (-oo:+oo)
6*((1/8)*x+1)+(3/4)*x = 12 // - 12
6*((1/8)*x+1)+(3/4)*x-12 = 0
6*(1/8*x+1)+(3*x)/4-12 = 0
(4*6*(1/8*x+1))/4+(3*x)/4+(-12*4)/4 = 0
4*6*(1/8*x+1)+3*x-12*4 = 0
6*x-48+24 = 0
6*x-24 = 0
(6*x-24)/4 = 0
(6*x-24)/4 = 0 // * 4
6*x-24 = 0
6*x-24 = 0 // + 24
6*x = 24 // : 6
x = 24/6
x = 4
x = 4
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