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= -3a - 5b + 2c - ( -11a + 3b - c)
= -3a - 5b + 2c + 11a - 3b + c
= -3a + 11a - 5b - 3b + 2c + c
= 8a - 8b + 3c
b) -10a² + a - 3 dari 6a² - 3a - 7
= 6a² - 3a - 7 - ( -10a² + a - 3)
= 6a² - 3a - 7 + 10a² - a + 3
= 6a² + 10a² - 3a - a - 7 + 3
= 16a²- 4a - 4
= -3a + 11a - 5b - 3b + 2c + c
= 8a - 8b + 3c
b. 6a² - 3a - 7 -(-10a² + a - 3)
= 6a² + 10a² - 3a - a - 7 + 3
= 16a² - 4a - 4