25-[20-{8/4-(15 25/5)÷2}]
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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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