Answer:
Step 3
Explanation:
Ernesto was doing well until he got to Step 3.
Its a little mistake but that chabges up the entire problem.
Let me explain-
In Step 2: 3(y+7)-2y is showing that you must distribute the 3 to the y and the 7 however Ernesto only did that for the y.
That would be the answer, hopw this helps.