(1) 6. Subtract 3xy + 5yz - 7zx from 5xy – 2yz +10xyz.
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Subtract 3xy+5yz−7zx from5xy−2yz−2zx+10xyz
5xy−2yz−2zx+10xyz−(3xy+5yz−7zx)
=5xy−2yz−2zx+10xyz−3xy−5yz+7zx
=2xy−7yz+5zx+10xyz
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