5x-[4y-{7x-(3z-2y)+4z-3(x+3y-2z)}]
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5x-[4y-{7x-(3z-2y)+4z-3(x+3y-2z)}]
= 5x - [ 4y - { 7x - 3z + 2y + 4z -3x - 9y +6z } ]
= 5x - 4y +7x - 3z + 2y + 4z -3x - 9y +6z
= 9x - 11y +7z
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