add. 7×y + 5yz- 3z× , 4yz + 9z×-4y-,3×z +5×-2×..
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7xy+5yz- 3zx, 4yz+ 9zx- 4y-, 3xz+5x- 2x.. = 7xy+ 9yz+ 3zx- 4y + 3x
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