he cannot times the 6 with -8
There is a mistake at Line 2. At Line 2, RHS, y - 48 should be 2y - 96. Because we must multiply at everything by 12 as it is the LCM of the three denominators - 3, 4, 6.
There is a mistake at line 2 . 48 should be changed to 96 as the common denominator is 12.
There is a mistake from line 1 to 2, the error is in 12(y/6+-8)=y-48 it should be 12(y/6+-8)=2y-96 because both sides must be multiplied by the same amount
In Line 2, the LHS cannot be cross multiplied if the sign is and addition sign. He should change the denominators all to 12 first.
In line 2, y - 48 should be 2y - 96.
In line 2, y-48 should have been 2y-96 as he cross multiplied the LHS