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x in (-oo:+oo)
4*((-2/4)*x+12/4)+2*x = 8 // - 8
4*((-2/4)*x+12/4)+2*x-8 = 0
4*(3-1/2*x)+2*x-8 = 0
4*(3-1/2*x)+2*x-8 = 0
12-8 = 0
4 = 0
4 = 0
x belongs to the empty set
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