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= 9a + 12 - 7a - 14
= 2a - 2
b. 15p + 18q - 17 - (12p - 7q + 6)
= 15p + 18q - 17 - 12p + 7q - 6
= 3p + 25q - 23
c. 4p - 11q - 9r - (-8p + 10q - 9r)
= 4p - 11q - 9r + 8p - 10q + 9r
= 12p - 21q