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x in (-oo:+oo)
x = 8-(2*(5-((1/2)*x))) // - 8-(2*(5-((1/2)*x)))
2*(5-((1/2)*x))+x-8 = 0
2*((-1/2)*x+5)+x-8 = 0
2*(5-1/2*x)+x-8 = 0
2*(5-1/2*x)+x-8 = 0
10-8 = 0
2 = 0
2 = 0
x belongs to the empty set
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