5a + b
7a-8b +7a – a – 8a + 9b + 9b – 9b
= (7a + 7a − a − 8a)+(−8b + 9b +9b – 9b
=5a + b
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Answer:
5a + b
Step-by-step explanation:
7a-8b +7a – a – 8a + 9b + 9b – 9b
= (7a + 7a − a − 8a)+(−8b + 9b +9b – 9b
=5a + b
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