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x in (-oo:+oo)
1*(1/2)*(1-(2*x)) = 3-x // - 3-x
1*(1/2)*(1-(2*x))+x-3 = 0
(1/2)*(1-2*x)+x-3 = 0
1/2*(1-2*x)+x-3 = 0
1/2*(1-2*x)+x-3 = 0
1/2-3 = 0
-5/2 = 0
-5/2 = 0
-5/2 = 0 // * 2
-5 = 0
x belongs to the empty set
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