16th one is the que please tell me fast
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2a-[4b-{4a-(3b-2a-2b)}]
2a-[4b-{4a-(-2a+b)}]
2a-[4b-{4a-2a-b}]
2a-[4b-{2a-b}]
2a-[4b-2a-b]
2a-[3b-2a]
2a-3b-2a
-3b
2a-[4b-{4a-(-2a+b)}]
2a-[4b-{4a-2a-b}]
2a-[4b-{2a-b}]
2a-[4b-2a-b]
2a-[3b-2a]
2a-3b-2a
-3b
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