Answer :

A. Let x be a real number,B. Add x to both sides of the equation, then C. x - x = 0,D. Therefore, x = 0

A. Let x be a real number - This step states that we are selecting a real number for which we will prove that it is equal to 0. This step does not contain an error.

B. Subtract x from both sides of the equation - This step does not contain an error as it is the first step in the process of proving that the real number is equal to 0.

C. x - x = 0 - This step contains an error, as it doesn't provide enough information to prove that the real number is equal to 0.

D. Therefore, x = 0 - This step also contains an error, as it assumes that the proof is correct without providing any evidence.

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