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(3a³ + 6a² - 3a) - (a² - 3a + 1a - 3)
(3a³ + 6a² - 3a) - (a² - 2a -3)
3a³ + 6a² - 3a - a² + 2a + 3
3a³ + 6a² - a² - 3a + 2a + 3
3a³ + 5a² - a + 3
= 3a³ + 6a² - 3a -a² +3a - a + 3
= 3a³ + 5a² - a + 3