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x in (-oo:+oo)
(1/2)*x-((1/2)*x)-1-1 = 1/40 // - 1/40
(1/2)*x-((1/2)*x)-(1/40)-1-1 = 0
(1/2)*x+(-1/2)*x-1/40-1-1 = 0
-81/40 = 0
x belongs to the empty set
x belongs to the empty set
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