2 - The simplified form of the equation is 3x = 1, the reason behind this is when you do the equation, you get x = 1/3. When you do the equation 3x = 1 you get x = 1/3 as well.
3 - The value of z in the equation is z = 13.
4 - In order to figure out what step he did something wrong on, we first need to solve the problem, the answer we will get is x = 2. To do this the easy way, we can solve each step, and see what one wouldn't equal 2, which the step he did wrong is Step 2. So, to do Step 2 correctly, it would be: Step 2 - 12x − 6 = 14 + 2x.
