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Add: 2xy + 4x, 3xy + 7z + 6y and 2x + 3y + 2z

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6x + 5xy + 9y − 9z

5xy + 6x + 9y + 9z

6x + 5xy − 9y + 9z

6x − 5xy + 9y + 9z

answer is B.

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Detailed Solution

Given: 2xy + 4x, 3xy + 7z + 6y and 2x + 3y + 2z

The sum = (2xy + 4x) + (3xy + 7z + 6y) + (2x + 3y + 2z)

Collecting the like terms together, we get

The sum = 2xy + 3xy + 4x + 2x + 6y + 3y + 7z + 2z

= 5xy + 6x + 9y + 9z

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