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x in (-oo:+oo)
(1/2)*(x+6) = (1/2)*x+3 // - (1/2)*x+3
(1/2)*(x+6)-((1/2)*x)-3 = 0
(1/2)*(x+6)+(-1/2)*x-3 = 0
1/2*(x+6)-x/2-3 = 0
(1/2*2*(x+6))/2-x/2+(-3*2)/2 = 0
1/2*2*(x+6)-x-3*2 = 0
6-6 = 0
0 = 0
0/2 = 0
0/2 = 0 // * 2
0 = 0
x belongs to the empty set
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