Simplify 18x -[-12y - {9z -(7y - 6x + 2z)}].
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18x-[-12y-{9z-(7y-6x+2z)}]
18x-[-12y-{9z-7y+6x-2z}]
18x-[-12y-{7z-7y-6x}]
18x-[-12y-7z+7y+6x]
18x-[-5y-7z+6x]
18x+5y+7z-6x
12x+5y+7z
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