12a-4a-9ab+7ab+5b-3b-3-12-8a-2ab+2b-15
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Answer:
Step-by-step 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
8a-2ab+2b-15
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