12-[9-{15-(12-9-5)}]
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Answer:
12-[9-{15-(12-9-5)}]
= 12-[9-{15-(12-14)}]
= 12-[9-{15-(-2)}]
= 12-[9-{5+2}]
= 12- [9-7]
= 12- 2
= 10
10 is the correct answer.
Hope it will be helpful for you.
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