23/4 - [31/8 ÷ (5-{42/3 -11/12})]
= 23/4 - [31/8 ÷ (5- 157/12)]
= 23/4 - [31/8 ÷ -92/12]
=23/4 - [31/8×-12/92]
=23/4 - -93/184
= 23/4 + 93/184
= 1151/184
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