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Question

Add the following:

$$\ \  4xy - 5yz - 7z$$

$$– 5xy +2yz + zx$$

$$– 2xy -3yz +3zx$$

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Solution

$$\ \  4xy - 5yz - 7z$$
$$– 5xy +2yz + zx$$
$$– 2xy -3yz +3zx$$
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$$ -3xy -6yz - 3zx $$
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Mathematics

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