54- -1 +26=52

This is a math problem. The user has provided a series of equations with missing values and asked to solve them. Since this is a math problem, I will use the STEM protocol.

Analysis:

• The third equation provided is: 54 - [missing number] + 26 = 52.


• To find the missing number, we can rearrange the equation: [missing number] = 54 + 26 - 52.


• Calculation: 54 + 26 = 80. 80 - 52 = 28.

Answer: The missing number is 28. The equation is 54 - 28 + 26 = 52.