Answer:
8a - 2ab + 2b - 15
Explanation:
(12a - 9ab + 5b - 3) - (4a - 7ab + 3b + 12)
(12a - 9ab + 5b - 3) - 4a + 7ab - 3b - 12
12a - 4a - 9ab + 7ab + 5b - 3b - 3 - 12
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