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x in (-oo:+oo)
(a+w)/2 = 6/6+6 // - 6/6+6
(a+w)/2-(6/6)-6 = 0
(a+w)/2-6-1 = 0
(a+w)/2+(-6*2)/2+(-1*2)/2 = 0
a+w-6*2-1*2 = 0
a+w-12-2 = 0
a+w-14 = 0
(a+w-14)/2 = 0
(a+w-14)/2 = 0 // * 2
a+w-14 = 0
x belongs to the empty set
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