25-[(-12)+{20/4-(41-18/2)/4}]
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Explanation:
25-[(-12)+{20/4-(82-18/2)/4}]
25-[(-12)+{20/4-32/4}]
25-[(-12)+{20-32/4}]
25-[(-12)+{-3}]
25-[(-12-3]
25-[-15]
25+15
40
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