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Add the algebraic expressions using both...

Add the algebraic expressions using both horizontal and vertical methods. And find out did you get the same answer with both methods: `2x+9y-7z`, `3y+z+3x`, 2x-4y-z`

A

7x-8y + 7z

B

-7x+8y-7z

C

7x-8y-7z

D

7x+8y-7z

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