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6a^3 - a^3 + a + 4a
= 5a^3 + 5a
2)
-9k^3 - k^3 + k² + 7k²
= -10k^3 + 8k²
3)
-2m^3 + m² - 3m² - 3m
= -2m^3 - 2m² - 3m