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x in (-oo:+oo)
(1/2)*(8-x) = 8-(x/2) // - 8-(x/2)
(1/2)*(8-x)+x/2-8 = 0
1/2*(8-x)+x/2-8 = 0
(1/2*2*(8-x))/2+x/2+(-8*2)/2 = 0
1/2*2*(8-x)+x-8*2 = 0
8-16 = 0
-8 = 0
-8/2 = 0
-8/2 = 0 // * 2
-8 = 0
x belongs to the empty set
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