It seems the student's solution or the problem context isn't visible here (possibly due to an image not loading). To help correct the student's work and explain their mistake, could you please share the details of the problem and the student's solution (e.g., type out the equations they solved, the steps they took, and the answer they got)? Once you provide that information, I can analyze the error and guide you through the correct approach.

For example, if the problem was "Solve 3(x - 2) = 15" and the student wrote:
Step 1: 3x - 2 = 15
Step 2: 3x = 17
Step 3: x = 17/3

Then the mistake is not distributing the 3 to both terms inside the parentheses (they only multiplied 3 by x, not by -2). The correct solution would be:
Step 1: 3x - 6 =15 (distribute 3: 3x -32)
Step 2: 3x =21 (add 6 to both sides)
Step3: x=7 (divide both sides by3)

But since I don't have your specific student's work, please share it, and I'll help!

Please provide the student's solution so I can assist further.
Thank you!

作者声明:本文包含人工智能生成内容。