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⇒ ( 6a² - 9a ) - ( 4a + 6 )
⇒ 3a ( 2a - 3 ) - 2 ( 2a - 3 )
⇒
9c² - 24c + 16 ⇒ 9c² -12c - 12c + 16
⇒ ( 9c² - 12c ) - ( 12c + 16 )
⇒ 3c ( 3c - 4 ) - 4 ( 3c - 4 )
⇒