the sum of 11xy+5yz-3zx,4yz+9zx-7y and -3xz+15x-2xy, then the answer is
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Step-by-step explanation:
11xy+5yz-3zx+4yz+9zx-7y-3xz+15x-2xy
=9xy+9yz+3zx+15x-7y
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