Find the unknown in a BODMAS equation

This type of question, asked 4 times: 24 Jul 2023 S1, 24 Jul 2023 S4, 10 Sep 2024 S3, 25 Sep 2024 S3. All 4 questions below, oldest first.

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Question 1
24 Jul 2023 S1
65 $720 \div 8 + 915 \div 15 - m + 32 \times 5 = 1104 \div 16 \times 111 \div 37$
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Question 2
24 Jul 2023 S4
75 $13 - [10 - \{16 + 8 \div (k - 2)\} + 2] = 20$
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Question 3
10 Sep 2024 S3
56 $45 \div 3 + 4 \times A - 48 \div 24 + 4 = 1$
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Question 4
25 Sep 2024 S3
60 $9 \times \text{N of } 4 \div 4 - 15 \times 4 = 12$
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Question 1