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x in (-oo:+oo)
3*(x+4) = x/2-8 // - x/2-8
3*(x+4)-(x/2)+8 = 0
3*(x+4)-x/2+8 = 0
(2*3*(x+4))/2-x/2+(2*8)/2 = 0
2*3*(x+4)-x+2*8 = 0
5*x+16+24 = 0
5*x+40 = 0
(5*x+40)/2 = 0
(5*x+40)/2 = 0 // * 2
5*x+40 = 0
5*x+40 = 0 // - 40
5*x = -40 // : 5
x = -40/5
x = -8
x = -8
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