24-[25-{26-(27-28-29)}]
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24-[25-{26-(27-28-29)}]
=24-[25-{26-27-57)}]
=24-[25-{26-(-30)}]
=24-[25-{26+30}]
=24-[25-56]
=24-(-31)
=24+31
=55
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