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![\frac{3m - n}{n + m} \div \frac{2n - 6m}{m + n} \frac{3m - n}{n + m} \div \frac{2n - 6m}{m + n}](https://tex.z-dn.net/?f=+%5Cfrac%7B3m+-+n%7D%7Bn+%2B+m%7D++%5Cdiv++%5Cfrac%7B2n+-+6m%7D%7Bm+%2B+n%7D+)
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