[20-2{5+(-12)}*{2(5-2-9)}]
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[20-2{5+(-12)*{2(5-2-9)}]
=[20–2{5-12}×{2(5–(-7)}]
=[20–2{-7}×{2(5+7)}]
=[20+14×{2(12)}]
=[20+14×{24}]
=[20+336]
=356
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