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∵ A-B = B-A ∴b-a>=0 b>=a ∵|a|=4 A = 4 or - 4 ∵|b|=3 | B = 3 or - 3 ∵b>=a ∴b=3 a=-4 b=-3 a=-4 A + B = - 1 or - 7
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