The work of a student to solve the equation 3 (2x - 4) = 8 + 2x + 6 is shown below:
Step 1: 3 (2x - 4) = 8 + 2x + 6
Step 2: 5x - 7 = 14 + 2x
Step 3: 5x - 2x = 14 + 7
Step 4: 3x = 21
Step 5: x = 7
In which step did the student first make an error and what is the correct step?
Step 2; 6x - 12 = 14 + 2x
Step 2; 6x - 7 = 2 (6 + x + 4)
Step 3; 5x - 2x = 14 - 7
Step 3; 5x + 2x = 14 + 7
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