How do you solve this 2 bracket 3a plus 4 bracket bracket a minus 6 bracket minus bracket 3 minus a bracket exponent of 2 plus 4 bracket 5 minus a bracket?

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How do you solve this 2 bracket 3a plus 4 bracket bracket a minus 6 bracket minus bracket 3 minus a bracket exponent of 2 plus 4 bracket 5 minus a bracket?