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A={x : |x| < 2 }
-2<x<2
A=(-2,2)
B={x : -2x + 1 ≥ 0 }
-2x≥-1
x≤1/2
B=(-∞,1/2>
AuB=(-∞,2)
AnB=(-2,1/2>
B\A =(-∞,-2>