{ab-[3a²b-(4a²b+1/2ab)]-4a²b}+3a²b

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{ab-[3a²b-(4a²b+1/2ab)]-4a²b}+3a²b{ab-[3a²b-(4a²b+1/2ab)]-4a²b}+3

{ab-[3a²b-(4a²b+1/2ab)]-4a²b}+3a²b
{ab-[3a²b-(4a²b+1/2ab)]-4a²b}+3a²b