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5x-[4y-{7x-3z+2y}+4z-3x-9y+6z]
5x-[4y-7x+3z-2y+4z-3x-9y+6z]
5x-4y+7x-3z+2y-4z+3x+9y-6z
5x+7x+3x-4y+2y+9y-3z-4z-6z
15x+7y-13z ANSWER
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