b) Simplify: 42-[ 20 - {18 ÷ ( 14-8+4)} ]
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Step-by-step explanation:
42-[ 20 - {18 ÷ ( 14-8+4)} ]
= 42-[20-{18÷(14-12)}]
= 42-[20-{18÷(2)}]
= 42-[20-{18÷2}]
= 42-[20-{9}]
= 42-[20-9]
= 42-[11]
= 42-11
= 31
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