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