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= (9b² -12b + 4) - (b² - 6b + 9)
= 9b² - 12b + 4 - b² + 6b - 9
= 8b² - 6b -5
= 9b² - 6b - 6b + 4 - b² - 3b - 3b + 9
= 9b² - b² - 6b - 6b -3b - 3b + 4 + 9
= 8b² - 18b + 13