-) 2a - [4b - {4a - 3(2a -b)}]
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Answer:
2a - [4b - ( 4a -6a + 3b)
2a - (4b - 4a + 6a - 3b)
2a - 4b + 4a - 6a + 3b
6a - 6a -b
-b
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