Advanced Math practice question

Answer: A. 1/(2x)

1/x = 2/(2x), so 2/(2x) − 1/(2x) = 1/(2x).

Why the other answers are wrong

B. 1/x

1/x would need the subtraction to remove nothing.

C. −1/(2x)

−1/(2x) subtracts in the wrong order.

D. 0

0 would need equal fractions, but 1/x is twice 1/(2x).

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