Can you infer the correct answer that should be filled in the blank? #puzzlegames #mathpuzzles

The question seems to require you to infer and fill in a suitable answer, but the crucial information is provided in the description area. The description area explicitly indicates the location of the answer and provides key clues for solving the question. By thoroughly examining the description, you will be able to easily find the correct answer and fill in the blank. The purpose of this question is to test your comprehension and problem-solving skills, so make sure to pay close attention to the description and fill in the answer correctly

【Detailed Explanation】
7 + 4 - 9 = 2
13 + 8 - 12 = 9
Pattern: Lower left + Lower right - Upper = Middle
Answer: 17 + 13 - 13 = 17