Answer:
B. 3f - 9g + 7
Explanation:
(-3f - 4g + 9) - (2 - 6f + 5g)
= -3f - 4g + 9 - 2 + 6f - 5g
= 3f - 9g + 7
So, the answer is B. 3f - 9g + 7
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