add. 7×y + 5yz- 3z× , 4yz + 9z×-4y-,3×z +5×-2×..
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expressions are
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- 7xy+5yz-3zx. 4yz+9zx-4y. -3xz+5x-2xy. we put like terms below like terms. 7xy+5yz-3zx. . . +4yz+9zx-4y. -2xy. -3xz +5x. 5xy+9yz+3zx-4y+5x .is a answer
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