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