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x in (-oo:+oo)
x-(2/8) = x+6/7-(1/2) // - x+6/7-(1/2)
x-x-(2/8)-(6/7)+1/2 = 0
x-x-1/4-6/7+1/2 = 0
-17/28 = 0
x belongs to the empty set
x belongs to the empty set
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