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