what is 7+[12-{8+3-(9of6+1-13×4)}]
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7+[12-{8+3-(9×6+1-13×4)}]
7+[12-{11-(3)}]
7+(12-(8))
7+4
=11
7+[12-{11-(3)}]
7+(12-(8))
7+4
=11
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