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