Advanced Math practice question

Answer: A. 2x

2x + 2y − 2y = 2x.

Why the other answers are wrong

B. 2x + 4y

This adds 2y instead of subtracting.

C. 2x − 2y

This forgets the +2y from distributing.

D. 2x + 2y

This forgets to subtract 2y.

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