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25-[20-{8/4-(15-25/5)/4}]

=25-[20-{8/4-(15-5)/4}]
=25-[20-{8/4-10/4]
=25-[20-{2-2.5}]
=25-[20-{-0.5}]
=25-[20+0.5]
=25-[20.5]
=4.5
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