b. 42-[20 - {19 - (14-8-4)}]
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the answer is 29
Step-by-step explanation:
42-[20 - {19 - (14-8-4)}]
= 42-[20 - {19 - (14-12}]
=42-[20 - {19 - 2}]
=42-[20 - 17]
=42-13
= 29
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