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Answer:
[tex]→ \frac{10 {m}^{5} {n}^{2} - 30mn}{5mn} \\ = \frac{10 {m}^{5} {n}^{2} }{5mn} - \frac{30mn}{5mn} \\ = \boxed {2 {m}^{4} n - 6}✓[/tex]