4a -7ab +3b+12 - 12a -9ab +5b -3
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Answer:
8(b -a -2ab) + 9
Step-by-step explanation:
4a -7ab +3b+12 -12a -9ab +5b -3
8b -8a -16ab + 9
8(b - a - 2ab) + 9
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