On simplification, 12 -3 [5+2 {(5-7) - 2 }] gives
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Answer:
12 - 3 [5 + 2 {(5-7)-2}]
= 12 - 3 [5 + 2 {-2-2}]
= 12 - 3 [5 + 2 -4]
= 12 - 3 [7 -4]
= 12 - 3 +3
= 15- 3
= 12
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