4a+[2a-{3b+(3a-2b)}]
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Answer:
4a + [2a - { 3b + (3a - 2b)}]
= 4a + [2a - {3b + 3a - 2b}]
= 4a + [2a - { b + 3a}]
= 4a + [ 2a - b - 3a]
= 4a + [-a - b]
= 4a - 5a - b
= -a - b
hope it helps you
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