Answer:
5a / 4 + 7b / 4 / 8 / 8 (sorry if it's wrong )
Explanation:
2a / 4 + 5b / 4 + 3a / 8 + 2b / 8
5a / 4 + 5b / 4 / 8 + 2b / 8
5a / 4 + 7b / 4 / 8 / 8
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