12 a - 9ab +5b- 3 - 9a - 6ab + 3b + 5
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Step-by-step explanation:
subtract 4a−7ab+3b+12 from 12a−9ab+5b−3
=12a−9ab+5b−3−(4a−7ab+3b+12)
=12a−9ab+5b−3−4a+7ab−3b−12
=8a−2ab+2b−15
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