Answer is step 2, 8x - 8= 12 + 4x
The student did not distribute the 2 into the parentheses properly which ruined their entire problem. With 2(4x-4) , you must multiply everything in parentheses by 2.
so 2 x 4x = 8x
2 x -4 = -8
making it 8x- 8 = 12 + 4x ( on the right side all you did was combine like terms)