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