6a – [5b – {3a – (2a – a - b)}]
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Answer:
6a – [5b – {3a – (2a – a - b)}]
= 6a - 5b - (3a - 2a + a + b)
= 6a - 5b - 3a + 3a - a - b)
= 5a - 6b
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