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Question

What should be added to xy3yz+4zx to get 4xy3zx+4yz+7 ?

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Solution

By subtracting xy3yz+4zx from 4xy3zx+4yz+7, we get the required expression.

Therefore, required expression =(4xy3zx+4yz+7)(xy3yz+4zx)

=4xy3zx+4yz+7xy+3yz4zx

=4xyxy3zx4zx+4yz+3yz+7

=3xy7zx+7yz+7

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