3a²-[5a-(½a-3)+2a²]+4 =

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3a²-[5a-(½a-3)+2a²]+4=3a²-[5a-(½a-3)+2a²]+4=3a²-[5a-(½a-3)+2

3a²-[5a-(½a-3)+2a²]+4 =
3a²-[5a-(½a-3)+2a²]+4 =

3a²-[5a-(½a-3)+2a²]+4 =