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Add 7x^(2)yz - 2x^(2)yz and 4x^(2)yz...

Add `7x^(2)yz - 2x^(2)yz and 4x^(2)yz`

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The correct Answer is:
`=(7-2+4)x^(2)yz= 9x^(2)yz`
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