15m²n-17mn+8mn², 13m²n-15mn-9mn², 12m²n+21mn-14mn²
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Step-by-step explanation:
15m²n- 17mn + 8mn² + 13m²n - 15mn - 9mn²+ 12m²n + 21mn - 14mn²
15m²n + 13m²n + 12m²n - 17mn - 15mn + 21mn +8mn² -9mn²-14mn²
40m²n - 11mn - 15mn²
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