Given the equation : 5 + x - 12 = x - 7: Part A. Solve the equation 5 + x - 12 = x - 7: . In your final answer, be sure to state the solution and include all of your work.

Part B. Use the values x = -4, 0, 5 to verify your solution to the equation 5 + x - 12 = x - 7: . In your final answer, include all of your calculations.