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x in (-oo:+oo)
(a+b)/8 = L // - L
(a+b)/8-L = 0
(a+b)/8+(8*(-L))/8 = 0
8*(-L)+a+b = 0
a-8*L+b = 0
(a-8*L+b)/8 = 0
(a-8*L+b)/8 = 0 // * 8
a-8*L+b = 0
x belongs to the empty set
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