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Sehingga:
1.)
(9a + 12) - (7a + 14)
= 9a + 12 - 7a - 14
= (9a - 7a) + (12 - 14)
= (9-7)a + (-2)
= 2a - 2
2.)
(11x²-17x+24)-(2x²+15x-18)
= 11x² - 17x + 24 - 2x² - 15x + 18
= (11x² - 2x²) + (-17x - 15x) + (24 + 18)
= 9x² - 32x + 42
3.)
(15p + 18q - 17) - (12p - 7q + 6)
= 15p + 18q - 17 - 12p + 7q - 6
= (15p - 12p) + (18q + 7q) + (-17 - 6)
= 3p + 25q - 23