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b² (a + ab +a²b + a + c)
b² (2a + a²b + ab + c)
4ab² - 12ab + 20a²b²
4ab (b - 3 + 5ab)
3m²n³ + 12mn² + 9m³n³
3mn² (mn² + 4 + 3m²n)
6m² - 3m + 9
3 (2m² - m + 3)