answer question number 3 fast
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Step-by-step explanation:
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Answer:
9m² - 8mn + 9
Step-by-step explanation:
6m² - mn + 9 - ( -3m² + 7mn )
→ 6m² - mn + 9 + 3m² - 7mn
→ 6m²+ 3m² - mn - 7mn + 9
→ 9m² - 8mn + 9