Simplify..
1. 4a–[2b–{6a–(2b–3a+b)}]
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Step-by-step explanation:
4a-(2b-(6a-(3b-3a)
4a-(2b-(6a-3b+3a)
4a-(2b-(9a-3b)
4a-(2b-9a+3b)
4a-(5b-9a)
4a-5b+9a
13a-5b
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