(b) 24 + { ( 6 ÷ 3 - 1) + 5 } ÷ 3 of 2 - 3 x 7
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24 +[( 6÷3-1)+5]÷3of2-3×7
= 24 +[ (2-1)+5]÷3of2-21
= 24 + 6÷3 of 2 - 21
= 24 + 2 × 2 - 21
= 24 + 4 - 21
= 28 - 21
= 7
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