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