9. Simplify:
(1) 2x (x - y - z) + 2y (x + y - z) + 2z (x - y + 2)
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this is your answer hope it helps you
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Explanation:
2x^2-2xy-2xz+2yx+2y^2-2yz+2xz-2yz+4z
2x^2+2y^2-4yz+4z
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