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= - m² + 8m - 11
semoga membantu ^_^
3m² + 6m - 2 - 4m² + 2m - 9
(3m² - 4m²) + (6m + 2m) + (- 2 - 9)
- m² + 8m + (- 11)
- m² + 8m - 11