The work of a student to solve the equation 3(3x -4) = 8 + 2x +5 is shown below:
Step 1: 3(3x -4) = 8 + 2x +5
Step 2: 6x - 7 = 13 +2x
Step 3: 6x -2x = 13 + 7
Step 4: 4x = 20
Step 5: x = 5
in which step did the student first make an error and what is the correct step?