30-37+=68

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 eighth equation provided is: 30 - 37 + [missing number] = 68.


• To find the missing number, we can rearrange the equation: [missing number] = 68 - 30 + 37.


• Calculation: 68 - 30 = 38. 38 + 37 = 75.

Answer: The missing number is 75. The equation is 30 - 37 + 75 = 68.