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= 3ab - 9 - 7ba²
= -7a²b + 3ab - 9
B. (4x + 5) + (3x - 4) + (9x - 3)
= 4x + 5 + 3x - 4 + 9x - 3
= 16x - 2
C. (4x + 5) - (3x - 4) + (9x - 3)
= 4x + 5 - 3x + 4 + 9x - 3
= 10x + 6