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Answer:
- 3a - 4b
Step-by-step explanation:
note that - (- ) = + and + (- ) = -
- 5a + 3b - (- 2a) - 7b
= - 5a + 3b + 2a - 7b ← collect like terms
= (- 5a + 2a) + (3b - 7b)
= - 3a + (- 4b)
= - 3a - 4b