2x + 9y - 7z , 3y + z - 3x, 2z - 4y - x
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Step-by-step explanation:
2x -3x - x, -7z + z +2z, 9y+3y-4y
-x -x, -6z +2z, 12y-4y
-2x, -4z, 8y
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