Given the equation 5 + x -12 = 2x - 7. part a. solve the equation 5 + x - 12 = 2x - 7. in your final answer, be sure to state the solution and include all of your work. part b. use the values x = -0.5,0,1 to prove your solution to the equation 5 + x - 12 = 2x - 7 . in your final answer, include all of your calculations.