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4.Subtract 7xy+5yz-3zx from the sum of 4yz+9zx-4y and -3xz+5x-2xy.

User Nedlinin
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4yz+9zx-4y+(-3xz+5x-2xy)-(7xy+5yz-3zx)=\\\\ 4yz+6xz-4y-2xy-7xy-5yz+3xz=\\\\ -yz-9xy+9xz-4y

User Deathbob
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